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Finding the Fourth Proportional to 83,722.40, 125,364.90 and 79,785.80

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Solution

The fourth proportional to 83,722.40, 125,364.90 and 79,785.80 is: 119,470.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,722.40 : 125,364.90 = 79,785.80 : x
  2. Step 2: Convert to fraction form
    83,722.40/125,364.90 = 79,785.80/x
  3. Step 3: Cross multiply
    83,722.40x = 125,364.90 × 79,785.80
  4. Step 4: Simplify right side
    83,722.40x = 10,002,338,838.42
  5. Step 5: Solve for x
    x = 10,002,338,838.42/83,722.40
  6. Step 6: Final answer
    x = 119,470.28

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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.