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Finding the Fourth Proportional to 3,560.76, 4,913.58 and 1,988.76

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Solution

The fourth proportional to 3,560.76, 4,913.58 and 1,988.76 is: 2,744.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,560.76 : 4,913.58 = 1,988.76 : x
  2. Step 2: Convert to fraction form
    3,560.76/4,913.58 = 1,988.76/x
  3. Step 3: Cross multiply
    3,560.76x = 4,913.58 × 1,988.76
  4. Step 4: Simplify right side
    3,560.76x = 9,771,931.36
  5. Step 5: Solve for x
    x = 9,771,931.36/3,560.76
  6. Step 6: Final answer
    x = 2,744.34

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Find fourth proportional to 1,780.38, 2,456.79 and 994.38
Half scale
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Double scale
Find fourth proportional to 3,561.76, 4,914.96 and 1,989.76
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.