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Finding the Fourth Proportional to 80,998.80, 121,498.20 and 72,141.45

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Solution

The fourth proportional to 80,998.80, 121,498.20 and 72,141.45 is: 108,212.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,998.80 : 121,498.20 = 72,141.45 : x
  2. Step 2: Convert to fraction form
    80,998.80/121,498.20 = 72,141.45/x
  3. Step 3: Cross multiply
    80,998.80x = 121,498.20 × 72,141.45
  4. Step 4: Simplify right side
    80,998.80x = 8,765,056,320.39
  5. Step 5: Solve for x
    x = 8,765,056,320.39/80,998.80
  6. Step 6: Final answer
    x = 108,212.18

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1.5x scale

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.