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Finding the Fourth Proportional to 136,711.80, 205,067.70 and 86,520.15

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Solution

The fourth proportional to 136,711.80, 205,067.70 and 86,520.15 is: 129,780.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,711.80 : 205,067.70 = 86,520.15 : x
  2. Step 2: Convert to fraction form
    136,711.80/205,067.70 = 86,520.15/x
  3. Step 3: Cross multiply
    136,711.80x = 205,067.70 × 86,520.15
  4. Step 4: Simplify right side
    136,711.80x = 17,742,488,164.16
  5. Step 5: Solve for x
    x = 17,742,488,164.16/136,711.80
  6. Step 6: Final answer
    x = 129,780.23

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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.