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Finding the Fourth Proportional to 80,766.80, 121,279.80 and 54,587.60

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Solution

The fourth proportional to 80,766.80, 121,279.80 and 54,587.60 is: 81,968.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,766.80 : 121,279.80 = 54,587.60 : x
  2. Step 2: Convert to fraction form
    80,766.80/121,279.80 = 54,587.60/x
  3. Step 3: Cross multiply
    80,766.80x = 121,279.80 × 54,587.60
  4. Step 4: Simplify right side
    80,766.80x = 6,620,373,210.48
  5. Step 5: Solve for x
    x = 6,620,373,210.48/80,766.80
  6. Step 6: Final answer
    x = 81,968.99

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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.