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Finding the Fourth Proportional to 8,279.88, 12,419.81 and 2,123.88

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Solution

The fourth proportional to 8,279.88, 12,419.81 and 2,123.88 is: 3,185.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,279.88 : 12,419.81 = 2,123.88 : x
  2. Step 2: Convert to fraction form
    8,279.88/12,419.81 = 2,123.88/x
  3. Step 3: Cross multiply
    8,279.88x = 12,419.81 × 2,123.88
  4. Step 4: Simplify right side
    8,279.88x = 26,378,186.06
  5. Step 5: Solve for x
    x = 26,378,186.06/8,279.88
  6. Step 6: Final answer
    x = 3,185.82

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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.