Home / 20,854.90-28,789.08-13,311.22

Finding the Fourth Proportional to 20,854.90, 28,789.08 and 13,311.22

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Solution

The fourth proportional to 20,854.90, 28,789.08 and 13,311.22 is: 18,375.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,854.90 : 28,789.08 = 13,311.22 : x
  2. Step 2: Convert to fraction form
    20,854.90/28,789.08 = 13,311.22/x
  3. Step 3: Cross multiply
    20,854.90x = 28,789.08 × 13,311.22
  4. Step 4: Simplify right side
    20,854.90x = 383,217,777.48
  5. Step 5: Solve for x
    x = 383,217,777.48/20,854.90
  6. Step 6: Final answer
    x = 18,375.43

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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.