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Finding the Fourth Proportional to 862.30, 1,287.95 and 747.10

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Solution

The fourth proportional to 862.30, 1,287.95 and 747.10 is: 1,115.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.30 : 1,287.95 = 747.10 : x
  2. Step 2: Convert to fraction form
    862.30/1,287.95 = 747.10/x
  3. Step 3: Cross multiply
    862.30x = 1,287.95 × 747.10
  4. Step 4: Simplify right side
    862.30x = 962,227.45
  5. Step 5: Solve for x
    x = 962,227.45/862.30
  6. Step 6: Final answer
    x = 1,115.88

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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.