Home / 20,781.88-28,663.12-13,229.44

Finding the Fourth Proportional to 20,781.88, 28,663.12 and 13,229.44

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Solution

The fourth proportional to 20,781.88, 28,663.12 and 13,229.44 is: 18,246.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.88 : 28,663.12 = 13,229.44 : x
  2. Step 2: Convert to fraction form
    20,781.88/28,663.12 = 13,229.44/x
  3. Step 3: Cross multiply
    20,781.88x = 28,663.12 × 13,229.44
  4. Step 4: Simplify right side
    20,781.88x = 379,197,026.25
  5. Step 5: Solve for x
    x = 379,197,026.25/20,781.88
  6. Step 6: Final answer
    x = 18,246.52

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1.5x scale

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.