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Finding the Fourth Proportional to 81,737.76, 121,891.34 and 80,990.38

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Solution

The fourth proportional to 81,737.76, 121,891.34 and 80,990.38 is: 120,776.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,737.76 : 121,891.34 = 80,990.38 : x
  2. Step 2: Convert to fraction form
    81,737.76/121,891.34 = 80,990.38/x
  3. Step 3: Cross multiply
    81,737.76x = 121,891.34 × 80,990.38
  4. Step 4: Simplify right side
    81,737.76x = 9,872,025,945.31
  5. Step 5: Solve for x
    x = 9,872,025,945.31/81,737.76
  6. Step 6: Final answer
    x = 120,776.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.