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Finding the Fourth Proportional to 724.17, 1,085.58 and 261.84

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Solution

The fourth proportional to 724.17, 1,085.58 and 261.84 is: 392.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.17 : 1,085.58 = 261.84 : x
  2. Step 2: Convert to fraction form
    724.17/1,085.58 = 261.84/x
  3. Step 3: Cross multiply
    724.17x = 1,085.58 × 261.84
  4. Step 4: Simplify right side
    724.17x = 284,248.27
  5. Step 5: Solve for x
    x = 284,248.27/724.17
  6. Step 6: Final answer
    x = 392.52

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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.