Home / 31,691.88-43,764.43-20,381.02

Finding the Fourth Proportional to 31,691.88, 43,764.43 and 20,381.02

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Solution

The fourth proportional to 31,691.88, 43,764.43 and 20,381.02 is: 28,144.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,691.88 : 43,764.43 = 20,381.02 : x
  2. Step 2: Convert to fraction form
    31,691.88/43,764.43 = 20,381.02/x
  3. Step 3: Cross multiply
    31,691.88x = 43,764.43 × 20,381.02
  4. Step 4: Simplify right side
    31,691.88x = 891,963,723.12
  5. Step 5: Solve for x
    x = 891,963,723.12/31,691.88
  6. Step 6: Final answer
    x = 28,144.87

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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.