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Finding the Fourth Proportional to 80,659, 111,309.42 and 45,331

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Solution

The fourth proportional to 80,659, 111,309.42 and 45,331 is: 62,556.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,659 : 111,309.42 = 45,331 : x
  2. Step 2: Convert to fraction form
    80,659/111,309.42 = 45,331/x
  3. Step 3: Cross multiply
    80,659x = 111,309.42 × 45,331
  4. Step 4: Simplify right side
    80,659x = 5,045,767,318.02
  5. Step 5: Solve for x
    x = 5,045,767,318.02/80,659
  6. Step 6: Final answer
    x = 62,556.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.