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Finding the Fourth Proportional to 862.20, 1,188.78 and 674.04

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Solution

The fourth proportional to 862.20, 1,188.78 and 674.04 is: 929.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.20 : 1,188.78 = 674.04 : x
  2. Step 2: Convert to fraction form
    862.20/1,188.78 = 674.04/x
  3. Step 3: Cross multiply
    862.20x = 1,188.78 × 674.04
  4. Step 4: Simplify right side
    862.20x = 801,285.27
  5. Step 5: Solve for x
    x = 801,285.27/862.20
  6. Step 6: Final answer
    x = 929.35

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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.