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Finding the Fourth Proportional to 80,662.80, 121,091.40 and 80,079.60

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Solution

The fourth proportional to 80,662.80, 121,091.40 and 80,079.60 is: 120,215.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,662.80 : 121,091.40 = 80,079.60 : x
  2. Step 2: Convert to fraction form
    80,662.80/121,091.40 = 80,079.60/x
  3. Step 3: Cross multiply
    80,662.80x = 121,091.40 × 80,079.60
  4. Step 4: Simplify right side
    80,662.80x = 9,696,950,875.44
  5. Step 5: Solve for x
    x = 9,696,950,875.44/80,662.80
  6. Step 6: Final answer
    x = 120,215.90

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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.