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Finding the Fourth Proportional to 87,640.70, 131,461.05 and 82,456.70

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Solution

The fourth proportional to 87,640.70, 131,461.05 and 82,456.70 is: 123,685.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,640.70 : 131,461.05 = 82,456.70 : x
  2. Step 2: Convert to fraction form
    87,640.70/131,461.05 = 82,456.70/x
  3. Step 3: Cross multiply
    87,640.70x = 131,461.05 × 82,456.70
  4. Step 4: Simplify right side
    87,640.70x = 10,839,844,361.54
  5. Step 5: Solve for x
    x = 10,839,844,361.54/87,640.70
  6. Step 6: Final answer
    x = 123,685.05

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1.5x scale

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.