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Finding the Fourth Proportional to 18,666.18, 27,991.95 and 8,270.64

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Solution

The fourth proportional to 18,666.18, 27,991.95 and 8,270.64 is: 12,402.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,666.18 : 27,991.95 = 8,270.64 : x
  2. Step 2: Convert to fraction form
    18,666.18/27,991.95 = 8,270.64/x
  3. Step 3: Cross multiply
    18,666.18x = 27,991.95 × 8,270.64
  4. Step 4: Simplify right side
    18,666.18x = 231,511,341.35
  5. Step 5: Solve for x
    x = 231,511,341.35/18,666.18
  6. Step 6: Final answer
    x = 12,402.72

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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.