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Finding the Fourth Proportional to 81,737, 121,890.22 and 80,989.63

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Solution

The fourth proportional to 81,737, 121,890.22 and 80,989.63 is: 120,775.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,737 : 121,890.22 = 80,989.63 : x
  2. Step 2: Convert to fraction form
    81,737/121,890.22 = 80,989.63/x
  3. Step 3: Cross multiply
    81,737x = 121,890.22 × 80,989.63
  4. Step 4: Simplify right side
    81,737x = 9,871,843,818.42
  5. Step 5: Solve for x
    x = 9,871,843,818.42/81,737
  6. Step 6: Final answer
    x = 120,775.71

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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.