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Finding the Fourth Proportional to 83,830.80, 125,600.40 and 68,959.20

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Solution

The fourth proportional to 83,830.80, 125,600.40 and 68,959.20 is: 103,318.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,830.80 : 125,600.40 = 68,959.20 : x
  2. Step 2: Convert to fraction form
    83,830.80/125,600.40 = 68,959.20/x
  3. Step 3: Cross multiply
    83,830.80x = 125,600.40 × 68,959.20
  4. Step 4: Simplify right side
    83,830.80x = 8,661,303,103.68
  5. Step 5: Solve for x
    x = 8,661,303,103.68/83,830.80
  6. Step 6: Final answer
    x = 103,318.86

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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.