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Finding the Fourth Proportional to 731.48, 1,008.81 and 638.09

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Solution

The fourth proportional to 731.48, 1,008.81 and 638.09 is: 880.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.48 : 1,008.81 = 638.09 : x
  2. Step 2: Convert to fraction form
    731.48/1,008.81 = 638.09/x
  3. Step 3: Cross multiply
    731.48x = 1,008.81 × 638.09
  4. Step 4: Simplify right side
    731.48x = 643,711.57
  5. Step 5: Solve for x
    x = 643,711.57/731.48
  6. Step 6: Final answer
    x = 880.01

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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.