Home / 87,116.80-130,675.20-81,211.90

Finding the Fourth Proportional to 87,116.80, 130,675.20 and 81,211.90

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Solution

The fourth proportional to 87,116.80, 130,675.20 and 81,211.90 is: 121,817.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,116.80 : 130,675.20 = 81,211.90 : x
  2. Step 2: Convert to fraction form
    87,116.80/130,675.20 = 81,211.90/x
  3. Step 3: Cross multiply
    87,116.80x = 130,675.20 × 81,211.90
  4. Step 4: Simplify right side
    87,116.80x = 10,612,381,274.88
  5. Step 5: Solve for x
    x = 10,612,381,274.88/87,116.80
  6. Step 6: Final answer
    x = 121,817.85

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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.