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Finding the Fourth Proportional to 88,687.90, 133,031.85 and 42,031.90

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Solution

The fourth proportional to 88,687.90, 133,031.85 and 42,031.90 is: 63,047.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    88,687.90 : 133,031.85 = 42,031.90 : x
  2. Step 2: Convert to fraction form
    88,687.90/133,031.85 = 42,031.90/x
  3. Step 3: Cross multiply
    88,687.90x = 133,031.85 × 42,031.90
  4. Step 4: Simplify right side
    88,687.90x = 5,591,581,416.02
  5. Step 5: Solve for x
    x = 5,591,581,416.02/88,687.90
  6. Step 6: Final answer
    x = 63,047.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.