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Finding the Fourth Proportional to 731.20, 1,098.84 and 438.74

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Solution

The fourth proportional to 731.20, 1,098.84 and 438.74 is: 659.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.20 : 1,098.84 = 438.74 : x
  2. Step 2: Convert to fraction form
    731.20/1,098.84 = 438.74/x
  3. Step 3: Cross multiply
    731.20x = 1,098.84 × 438.74
  4. Step 4: Simplify right side
    731.20x = 482,105.06
  5. Step 5: Solve for x
    x = 482,105.06/731.20
  6. Step 6: Final answer
    x = 659.33

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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.