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Finding the Fourth Proportional to 724.18, 1,086.72 and 291.38

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Solution

The fourth proportional to 724.18, 1,086.72 and 291.38 is: 437.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.18 : 1,086.72 = 291.38 : x
  2. Step 2: Convert to fraction form
    724.18/1,086.72 = 291.38/x
  3. Step 3: Cross multiply
    724.18x = 1,086.72 × 291.38
  4. Step 4: Simplify right side
    724.18x = 316,648.47
  5. Step 5: Solve for x
    x = 316,648.47/724.18
  6. Step 6: Final answer
    x = 437.25

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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.