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Finding the Fourth Proportional to 80,939.71, 121,409.16 and 21,770.56

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Solution

The fourth proportional to 80,939.71, 121,409.16 and 21,770.56 is: 32,655.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,939.71 : 121,409.16 = 21,770.56 : x
  2. Step 2: Convert to fraction form
    80,939.71/121,409.16 = 21,770.56/x
  3. Step 3: Cross multiply
    80,939.71x = 121,409.16 × 21,770.56
  4. Step 4: Simplify right side
    80,939.71x = 2,643,145,402.33
  5. Step 5: Solve for x
    x = 2,643,145,402.33/80,939.71
  6. Step 6: Final answer
    x = 32,655.73

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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.