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Finding the Fourth Proportional to 136,720.70, 205,081.05 and 83,959.10

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Solution

The fourth proportional to 136,720.70, 205,081.05 and 83,959.10 is: 125,938.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,720.70 : 205,081.05 = 83,959.10 : x
  2. Step 2: Convert to fraction form
    136,720.70/205,081.05 = 83,959.10/x
  3. Step 3: Cross multiply
    136,720.70x = 205,081.05 × 83,959.10
  4. Step 4: Simplify right side
    136,720.70x = 17,218,420,385.06
  5. Step 5: Solve for x
    x = 17,218,420,385.06/136,720.70
  6. Step 6: Final answer
    x = 125,938.65

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Similar ratio
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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.