Home / 20,486.61-28,279.17-11,991.42

Finding the Fourth Proportional to 20,486.61, 28,279.17 and 11,991.42

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Solution

The fourth proportional to 20,486.61, 28,279.17 and 11,991.42 is: 16,552.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,486.61 : 28,279.17 = 11,991.42 : x
  2. Step 2: Convert to fraction form
    20,486.61/28,279.17 = 11,991.42/x
  3. Step 3: Cross multiply
    20,486.61x = 28,279.17 × 11,991.42
  4. Step 4: Simplify right side
    20,486.61x = 339,107,404.72
  5. Step 5: Solve for x
    x = 339,107,404.72/20,486.61
  6. Step 6: Final answer
    x = 16,552.64

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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.