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Finding the Fourth Proportional to 18,387.90, 27,581.82 and 7,999.64

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Solution

The fourth proportional to 18,387.90, 27,581.82 and 7,999.64 is: 11,999.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,387.90 : 27,581.82 = 7,999.64 : x
  2. Step 2: Convert to fraction form
    18,387.90/27,581.82 = 7,999.64/x
  3. Step 3: Cross multiply
    18,387.90x = 27,581.82 × 7,999.64
  4. Step 4: Simplify right side
    18,387.90x = 220,644,630.54
  5. Step 5: Solve for x
    x = 220,644,630.54/18,387.90
  6. Step 6: Final answer
    x = 11,999.45

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1.5x scale

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.