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Finding the Fourth Proportional to 862.62, 1,191.20 and 627.92

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Solution

The fourth proportional to 862.62, 1,191.20 and 627.92 is: 867.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.62 : 1,191.20 = 627.92 : x
  2. Step 2: Convert to fraction form
    862.62/1,191.20 = 627.92/x
  3. Step 3: Cross multiply
    862.62x = 1,191.20 × 627.92
  4. Step 4: Simplify right side
    862.62x = 747,969.21
  5. Step 5: Solve for x
    x = 747,969.21/862.62
  6. Step 6: Final answer
    x = 867.09

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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.