Home / 80,939.60-121,366.20-34,139.60

Finding the Fourth Proportional to 80,939.60, 121,366.20 and 34,139.60

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Solution

The fourth proportional to 80,939.60, 121,366.20 and 34,139.60 is: 51,191.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,939.60 : 121,366.20 = 34,139.60 : x
  2. Step 2: Convert to fraction form
    80,939.60/121,366.20 = 34,139.60/x
  3. Step 3: Cross multiply
    80,939.60x = 121,366.20 × 34,139.60
  4. Step 4: Simplify right side
    80,939.60x = 4,143,393,521.52
  5. Step 5: Solve for x
    x = 4,143,393,521.52/80,939.60
  6. Step 6: Final answer
    x = 51,191.18

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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.