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Finding the Fourth Proportional to 724.38, 1,085.78 and 359.44

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Solution

The fourth proportional to 724.38, 1,085.78 and 359.44 is: 538.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.38 : 1,085.78 = 359.44 : x
  2. Step 2: Convert to fraction form
    724.38/1,085.78 = 359.44/x
  3. Step 3: Cross multiply
    724.38x = 1,085.78 × 359.44
  4. Step 4: Simplify right side
    724.38x = 390,272.76
  5. Step 5: Solve for x
    x = 390,272.76/724.38
  6. Step 6: Final answer
    x = 538.77

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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.