Home / 20,820.11-28,732.43-11,388.66

Finding the Fourth Proportional to 20,820.11, 28,732.43 and 11,388.66

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Solution

The fourth proportional to 20,820.11, 28,732.43 and 11,388.66 is: 15,716.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.11 : 28,732.43 = 11,388.66 : x
  2. Step 2: Convert to fraction form
    20,820.11/28,732.43 = 11,388.66/x
  3. Step 3: Cross multiply
    20,820.11x = 28,732.43 × 11,388.66
  4. Step 4: Simplify right side
    20,820.11x = 327,223,876.24
  5. Step 5: Solve for x
    x = 327,223,876.24/20,820.11
  6. Step 6: Final answer
    x = 15,716.72

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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.