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Finding the Fourth Proportional to 1,125.60, 1,685.28 and 636.84

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Solution

The fourth proportional to 1,125.60, 1,685.28 and 636.84 is: 953.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.60 : 1,685.28 = 636.84 : x
  2. Step 2: Convert to fraction form
    1,125.60/1,685.28 = 636.84/x
  3. Step 3: Cross multiply
    1,125.60x = 1,685.28 × 636.84
  4. Step 4: Simplify right side
    1,125.60x = 1,073,253.72
  5. Step 5: Solve for x
    x = 1,073,253.72/1,125.60
  6. Step 6: Final answer
    x = 953.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.