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Finding the Fourth Proportional to 724.61, 1,086.89 and 204.59

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Solution

The fourth proportional to 724.61, 1,086.89 and 204.59 is: 306.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.61 : 1,086.89 = 204.59 : x
  2. Step 2: Convert to fraction form
    724.61/1,086.89 = 204.59/x
  3. Step 3: Cross multiply
    724.61x = 1,086.89 × 204.59
  4. Step 4: Simplify right side
    724.61x = 222,368.52
  5. Step 5: Solve for x
    x = 222,368.52/724.61
  6. Step 6: Final answer
    x = 306.88

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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.