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Finding the Fourth Proportional to 13,274.76, 18,321.58 and 7,685.76

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Solution

The fourth proportional to 13,274.76, 18,321.58 and 7,685.76 is: 10,607.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,274.76 : 18,321.58 = 7,685.76 : x
  2. Step 2: Convert to fraction form
    13,274.76/18,321.58 = 7,685.76/x
  3. Step 3: Cross multiply
    13,274.76x = 18,321.58 × 7,685.76
  4. Step 4: Simplify right side
    13,274.76x = 140,815,266.70
  5. Step 5: Solve for x
    x = 140,815,266.70/13,274.76
  6. Step 6: Final answer
    x = 10,607.74

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Half scale
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Double scale
Find fourth proportional to 13,275.76, 18,322.96 and 7,686.76
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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.