Home / 20,645.77-28,489.20-11,691.55

Finding the Fourth Proportional to 20,645.77, 28,489.20 and 11,691.55

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Solution

The fourth proportional to 20,645.77, 28,489.20 and 11,691.55 is: 16,133.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,645.77 : 28,489.20 = 11,691.55 : x
  2. Step 2: Convert to fraction form
    20,645.77/28,489.20 = 11,691.55/x
  3. Step 3: Cross multiply
    20,645.77x = 28,489.20 × 11,691.55
  4. Step 4: Simplify right side
    20,645.77x = 333,082,906.26
  5. Step 5: Solve for x
    x = 333,082,906.26/20,645.77
  6. Step 6: Final answer
    x = 16,133.23

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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.