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Finding the Fourth Proportional to 87,139.20, 130,708.80 and 83,858.70

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Solution

The fourth proportional to 87,139.20, 130,708.80 and 83,858.70 is: 125,788.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,139.20 : 130,708.80 = 83,858.70 : x
  2. Step 2: Convert to fraction form
    87,139.20/130,708.80 = 83,858.70/x
  3. Step 3: Cross multiply
    87,139.20x = 130,708.80 × 83,858.70
  4. Step 4: Simplify right side
    87,139.20x = 10,961,070,046.56
  5. Step 5: Solve for x
    x = 10,961,070,046.56/87,139.20
  6. Step 6: Final answer
    x = 125,788.05

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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.