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Finding the Fourth Proportional to 8,139.78, 12,209.70 and 1,983.78

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Solution

The fourth proportional to 8,139.78, 12,209.70 and 1,983.78 is: 2,975.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,139.78 : 12,209.70 = 1,983.78 : x
  2. Step 2: Convert to fraction form
    8,139.78/12,209.70 = 1,983.78/x
  3. Step 3: Cross multiply
    8,139.78x = 12,209.70 × 1,983.78
  4. Step 4: Simplify right side
    8,139.78x = 24,221,358.67
  5. Step 5: Solve for x
    x = 24,221,358.67/8,139.78
  6. Step 6: Final answer
    x = 2,975.68

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Double scale
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Similar ratio
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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.