Home / 20,854.90-28,780.13-11,422.85

Finding the Fourth Proportional to 20,854.90, 28,780.13 and 11,422.85

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Solution

The fourth proportional to 20,854.90, 28,780.13 and 11,422.85 is: 15,763.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,854.90 : 28,780.13 = 11,422.85 : x
  2. Step 2: Convert to fraction form
    20,854.90/28,780.13 = 11,422.85/x
  3. Step 3: Cross multiply
    20,854.90x = 28,780.13 × 11,422.85
  4. Step 4: Simplify right side
    20,854.90x = 328,751,107.97
  5. Step 5: Solve for x
    x = 328,751,107.97/20,854.90
  6. Step 6: Final answer
    x = 15,763.73

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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.