Home / 20,784.30-28,691.77-13,240.97

Finding the Fourth Proportional to 20,784.30, 28,691.77 and 13,240.97

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Solution

The fourth proportional to 20,784.30, 28,691.77 and 13,240.97 is: 18,278.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,784.30 : 28,691.77 = 13,240.97 : x
  2. Step 2: Convert to fraction form
    20,784.30/28,691.77 = 13,240.97/x
  3. Step 3: Cross multiply
    20,784.30x = 28,691.77 × 13,240.97
  4. Step 4: Simplify right side
    20,784.30x = 379,906,821.68
  5. Step 5: Solve for x
    x = 379,906,821.68/20,784.30
  6. Step 6: Final answer
    x = 18,278.55

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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.