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Finding the Fourth Proportional to 724.59, 1,085.63 and 560.39

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Solution

The fourth proportional to 724.59, 1,085.63 and 560.39 is: 839.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.59 : 1,085.63 = 560.39 : x
  2. Step 2: Convert to fraction form
    724.59/1,085.63 = 560.39/x
  3. Step 3: Cross multiply
    724.59x = 1,085.63 × 560.39
  4. Step 4: Simplify right side
    724.59x = 608,367.97
  5. Step 5: Solve for x
    x = 608,367.97/724.59
  6. Step 6: Final answer
    x = 839.60

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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.