Home / 80,939.80-121,215.30-77,440.60

Finding the Fourth Proportional to 80,939.80, 121,215.30 and 77,440.60

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Solution

The fourth proportional to 80,939.80, 121,215.30 and 77,440.60 is: 115,974.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,939.80 : 121,215.30 = 77,440.60 : x
  2. Step 2: Convert to fraction form
    80,939.80/121,215.30 = 77,440.60/x
  3. Step 3: Cross multiply
    80,939.80x = 121,215.30 × 77,440.60
  4. Step 4: Simplify right side
    80,939.80x = 9,386,985,561.18
  5. Step 5: Solve for x
    x = 9,386,985,561.18/80,939.80
  6. Step 6: Final answer
    x = 115,974.90

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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.