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Finding the Fourth Proportional to 12,139.80, 18,198.90 and 7,204.20

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Solution

The fourth proportional to 12,139.80, 18,198.90 and 7,204.20 is: 10,799.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,139.80 : 18,198.90 = 7,204.20 : x
  2. Step 2: Convert to fraction form
    12,139.80/18,198.90 = 7,204.20/x
  3. Step 3: Cross multiply
    12,139.80x = 18,198.90 × 7,204.20
  4. Step 4: Simplify right side
    12,139.80x = 131,108,515.38
  5. Step 5: Solve for x
    x = 131,108,515.38/12,139.80
  6. Step 6: Final answer
    x = 10,799.89

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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.