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Finding the Fourth Proportional to 987.13, 1,363.92 and 862.60

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Solution

The fourth proportional to 987.13, 1,363.92 and 862.60 is: 1,191.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.13 : 1,363.92 = 862.60 : x
  2. Step 2: Convert to fraction form
    987.13/1,363.92 = 862.60/x
  3. Step 3: Cross multiply
    987.13x = 1,363.92 × 862.60
  4. Step 4: Simplify right side
    987.13x = 1,176,517.39
  5. Step 5: Solve for x
    x = 1,176,517.39/987.13
  6. Step 6: Final answer
    x = 1,191.86

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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.