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Finding the Fourth Proportional to 80,987.20, 121,480.80 and 77,876.80

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Solution

The fourth proportional to 80,987.20, 121,480.80 and 77,876.80 is: 116,815.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,987.20 : 121,480.80 = 77,876.80 : x
  2. Step 2: Convert to fraction form
    80,987.20/121,480.80 = 77,876.80/x
  3. Step 3: Cross multiply
    80,987.20x = 121,480.80 × 77,876.80
  4. Step 4: Simplify right side
    80,987.20x = 9,460,535,965.44
  5. Step 5: Solve for x
    x = 9,460,535,965.44/80,987.20
  6. Step 6: Final answer
    x = 116,815.20

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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.