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Finding the Fourth Proportional to 17,979.58, 26,978.48 and 12,123.88

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Solution

The fourth proportional to 17,979.58, 26,978.48 and 12,123.88 is: 18,191.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,979.58 : 26,978.48 = 12,123.88 : x
  2. Step 2: Convert to fraction form
    17,979.58/26,978.48 = 12,123.88/x
  3. Step 3: Cross multiply
    17,979.58x = 26,978.48 × 12,123.88
  4. Step 4: Simplify right side
    17,979.58x = 327,083,854.10
  5. Step 5: Solve for x
    x = 327,083,854.10/17,979.58
  6. Step 6: Final answer
    x = 18,191.96

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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.