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Finding the Fourth Proportional to 21,423.80, 29,565.78 and 11,992.52

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Solution

The fourth proportional to 21,423.80, 29,565.78 and 11,992.52 is: 16,550.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,423.80 : 29,565.78 = 11,992.52 : x
  2. Step 2: Convert to fraction form
    21,423.80/29,565.78 = 11,992.52/x
  3. Step 3: Cross multiply
    21,423.80x = 29,565.78 × 11,992.52
  4. Step 4: Simplify right side
    21,423.80x = 354,568,207.97
  5. Step 5: Solve for x
    x = 354,568,207.97/21,423.80
  6. Step 6: Final answer
    x = 16,550.20

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.