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Finding the Fourth Proportional to 90,687.80, 136,031.70 and 80,838.20

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Solution

The fourth proportional to 90,687.80, 136,031.70 and 80,838.20 is: 121,257.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,687.80 : 136,031.70 = 80,838.20 : x
  2. Step 2: Convert to fraction form
    90,687.80/136,031.70 = 80,838.20/x
  3. Step 3: Cross multiply
    90,687.80x = 136,031.70 × 80,838.20
  4. Step 4: Simplify right side
    90,687.80x = 10,996,557,770.94
  5. Step 5: Solve for x
    x = 10,996,557,770.94/90,687.80
  6. Step 6: Final answer
    x = 121,257.30

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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.