Home / 20,854.20-28,778.64-11,422.80

Finding the Fourth Proportional to 20,854.20, 28,778.64 and 11,422.80

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Solution

The fourth proportional to 20,854.20, 28,778.64 and 11,422.80 is: 15,763.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,854.20 : 28,778.64 = 11,422.80 : x
  2. Step 2: Convert to fraction form
    20,854.20/28,778.64 = 11,422.80/x
  3. Step 3: Cross multiply
    20,854.20x = 28,778.64 × 11,422.80
  4. Step 4: Simplify right side
    20,854.20x = 328,732,648.99
  5. Step 5: Solve for x
    x = 328,732,648.99/20,854.20
  6. Step 6: Final answer
    x = 15,763.38

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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.