Home / 20,659.88-28,514.76-13,115.20

Finding the Fourth Proportional to 20,659.88, 28,514.76 and 13,115.20

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Solution

The fourth proportional to 20,659.88, 28,514.76 and 13,115.20 is: 18,101.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,659.88 : 28,514.76 = 13,115.20 : x
  2. Step 2: Convert to fraction form
    20,659.88/28,514.76 = 13,115.20/x
  3. Step 3: Cross multiply
    20,659.88x = 28,514.76 × 13,115.20
  4. Step 4: Simplify right side
    20,659.88x = 373,976,780.35
  5. Step 5: Solve for x
    x = 373,976,780.35/20,659.88
  6. Step 6: Final answer
    x = 18,101.59

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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.