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Finding the Fourth Proportional to 83,947.40, 125,921.10 and 80,721.80

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Solution

The fourth proportional to 83,947.40, 125,921.10 and 80,721.80 is: 121,082.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,947.40 : 125,921.10 = 80,721.80 : x
  2. Step 2: Convert to fraction form
    83,947.40/125,921.10 = 80,721.80/x
  3. Step 3: Cross multiply
    83,947.40x = 125,921.10 × 80,721.80
  4. Step 4: Simplify right side
    83,947.40x = 10,164,577,849.98
  5. Step 5: Solve for x
    x = 10,164,577,849.98/83,947.40
  6. Step 6: Final answer
    x = 121,082.70

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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.