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Finding the Fourth Proportional to 731.44, 1,007.04 and 638.02

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Solution

The fourth proportional to 731.44, 1,007.04 and 638.02 is: 878.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.44 : 1,007.04 = 638.02 : x
  2. Step 2: Convert to fraction form
    731.44/1,007.04 = 638.02/x
  3. Step 3: Cross multiply
    731.44x = 1,007.04 × 638.02
  4. Step 4: Simplify right side
    731.44x = 642,511.66
  5. Step 5: Solve for x
    x = 642,511.66/731.44
  6. Step 6: Final answer
    x = 878.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.