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Finding the Fourth Proportional to 724.27, 1,085.87 and 359.32

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Solution

The fourth proportional to 724.27, 1,085.87 and 359.32 is: 538.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.27 : 1,085.87 = 359.32 : x
  2. Step 2: Convert to fraction form
    724.27/1,085.87 = 359.32/x
  3. Step 3: Cross multiply
    724.27x = 1,085.87 × 359.32
  4. Step 4: Simplify right side
    724.27x = 390,171.22
  5. Step 5: Solve for x
    x = 390,171.22/724.27
  6. Step 6: Final answer
    x = 538.71

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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.