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Finding the Fourth Proportional to 1,087.92, 1,500.90 and 645.78

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Solution

The fourth proportional to 1,087.92, 1,500.90 and 645.78 is: 890.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.92 : 1,500.90 = 645.78 : x
  2. Step 2: Convert to fraction form
    1,087.92/1,500.90 = 645.78/x
  3. Step 3: Cross multiply
    1,087.92x = 1,500.90 × 645.78
  4. Step 4: Simplify right side
    1,087.92x = 969,251.20
  5. Step 5: Solve for x
    x = 969,251.20/1,087.92
  6. Step 6: Final answer
    x = 890.92

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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.