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Finding the Fourth Proportional to 20,662.31, 28,514.31 and 11,230.90

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Solution

The fourth proportional to 20,662.31, 28,514.31 and 11,230.90 is: 15,498.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,662.31 : 28,514.31 = 11,230.90 : x
  2. Step 2: Convert to fraction form
    20,662.31/28,514.31 = 11,230.90/x
  3. Step 3: Cross multiply
    20,662.31x = 28,514.31 × 11,230.90
  4. Step 4: Simplify right side
    20,662.31x = 320,241,221.61
  5. Step 5: Solve for x
    x = 320,241,221.61/20,662.31
  6. Step 6: Final answer
    x = 15,498.81

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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.