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Finding the Fourth Proportional to 731.65, 1,007.35 and 681.97

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Solution

The fourth proportional to 731.65, 1,007.35 and 681.97 is: 938.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.65 : 1,007.35 = 681.97 : x
  2. Step 2: Convert to fraction form
    731.65/1,007.35 = 681.97/x
  3. Step 3: Cross multiply
    731.65x = 1,007.35 × 681.97
  4. Step 4: Simplify right side
    731.65x = 686,982.48
  5. Step 5: Solve for x
    x = 686,982.48/731.65
  6. Step 6: Final answer
    x = 938.95

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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.