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Finding the Fourth Proportional to 20,279.70, 27,980.94 and 12,321.42

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Solution

The fourth proportional to 20,279.70, 27,980.94 and 12,321.42 is: 17,000.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,279.70 : 27,980.94 = 12,321.42 : x
  2. Step 2: Convert to fraction form
    20,279.70/27,980.94 = 12,321.42/x
  3. Step 3: Cross multiply
    20,279.70x = 27,980.94 × 12,321.42
  4. Step 4: Simplify right side
    20,279.70x = 344,764,913.73
  5. Step 5: Solve for x
    x = 344,764,913.73/20,279.70
  6. Step 6: Final answer
    x = 17,000.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.