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Finding the Fourth Proportional to 18,387.30, 27,565.38 and 8,388.48

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Solution

The fourth proportional to 18,387.30, 27,565.38 and 8,388.48 is: 12,575.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,387.30 : 27,565.38 = 8,388.48 : x
  2. Step 2: Convert to fraction form
    18,387.30/27,565.38 = 8,388.48/x
  3. Step 3: Cross multiply
    18,387.30x = 27,565.38 × 8,388.48
  4. Step 4: Simplify right side
    18,387.30x = 231,231,638.82
  5. Step 5: Solve for x
    x = 231,231,638.82/18,387.30
  6. Step 6: Final answer
    x = 12,575.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.