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Finding the Fourth Proportional to 731.20, 1,087.41 and 708.13

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Solution

The fourth proportional to 731.20, 1,087.41 and 708.13 is: 1,053.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.20 : 1,087.41 = 708.13 : x
  2. Step 2: Convert to fraction form
    731.20/1,087.41 = 708.13/x
  3. Step 3: Cross multiply
    731.20x = 1,087.41 × 708.13
  4. Step 4: Simplify right side
    731.20x = 770,030.73
  5. Step 5: Solve for x
    x = 770,030.73/731.20
  6. Step 6: Final answer
    x = 1,053.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.