Home / 20,805.72-28,713.90-11,375.70

Finding the Fourth Proportional to 20,805.72, 28,713.90 and 11,375.70

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Solution

The fourth proportional to 20,805.72, 28,713.90 and 11,375.70 is: 15,699.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,805.72 : 28,713.90 = 11,375.70 : x
  2. Step 2: Convert to fraction form
    20,805.72/28,713.90 = 11,375.70/x
  3. Step 3: Cross multiply
    20,805.72x = 28,713.90 × 11,375.70
  4. Step 4: Simplify right side
    20,805.72x = 326,640,712.23
  5. Step 5: Solve for x
    x = 326,640,712.23/20,805.72
  6. Step 6: Final answer
    x = 15,699.56

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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.