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Finding the Fourth Proportional to 724.59, 1,085.04 and 505.89

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Solution

The fourth proportional to 724.59, 1,085.04 and 505.89 is: 757.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.59 : 1,085.04 = 505.89 : x
  2. Step 2: Convert to fraction form
    724.59/1,085.04 = 505.89/x
  3. Step 3: Cross multiply
    724.59x = 1,085.04 × 505.89
  4. Step 4: Simplify right side
    724.59x = 548,910.89
  5. Step 5: Solve for x
    x = 548,910.89/724.59
  6. Step 6: Final answer
    x = 757.55

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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.