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Finding the Fourth Proportional to 724.12, 1,086.14 and 358.78

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Solution

The fourth proportional to 724.12, 1,086.14 and 358.78 is: 538.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.12 : 1,086.14 = 358.78 : x
  2. Step 2: Convert to fraction form
    724.12/1,086.14 = 358.78/x
  3. Step 3: Cross multiply
    724.12x = 1,086.14 × 358.78
  4. Step 4: Simplify right side
    724.12x = 389,685.31
  5. Step 5: Solve for x
    x = 389,685.31/724.12
  6. Step 6: Final answer
    x = 538.15

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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.