Home / 20,819.25-28,729.98-11,387.61

Finding the Fourth Proportional to 20,819.25, 28,729.98 and 11,387.61

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Solution

The fourth proportional to 20,819.25, 28,729.98 and 11,387.61 is: 15,714.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,819.25 : 28,729.98 = 11,387.61 : x
  2. Step 2: Convert to fraction form
    20,819.25/28,729.98 = 11,387.61/x
  3. Step 3: Cross multiply
    20,819.25x = 28,729.98 × 11,387.61
  4. Step 4: Simplify right side
    20,819.25x = 327,165,807.55
  5. Step 5: Solve for x
    x = 327,165,807.55/20,819.25
  6. Step 6: Final answer
    x = 15,714.58

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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.