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Finding the Fourth Proportional to 724.74, 1,085.28 and 520.62

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Solution

The fourth proportional to 724.74, 1,085.28 and 520.62 is: 779.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.74 : 1,085.28 = 520.62 : x
  2. Step 2: Convert to fraction form
    724.74/1,085.28 = 520.62/x
  3. Step 3: Cross multiply
    724.74x = 1,085.28 × 520.62
  4. Step 4: Simplify right side
    724.74x = 565,018.47
  5. Step 5: Solve for x
    x = 565,018.47/724.74
  6. Step 6: Final answer
    x = 779.62

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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.