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Finding the Fourth Proportional to 83,115.20, 124,672.80 and 20,785.70

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Solution

The fourth proportional to 83,115.20, 124,672.80 and 20,785.70 is: 31,178.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,115.20 : 124,672.80 = 20,785.70 : x
  2. Step 2: Convert to fraction form
    83,115.20/124,672.80 = 20,785.70/x
  3. Step 3: Cross multiply
    83,115.20x = 124,672.80 × 20,785.70
  4. Step 4: Simplify right side
    83,115.20x = 2,591,410,795.60
  5. Step 5: Solve for x
    x = 2,591,410,795.60/83,115.20
  6. Step 6: Final answer
    x = 31,178.54

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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.