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Finding the Fourth Proportional to 10,979.70, 16,469.55 and 5,147.70

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Solution

The fourth proportional to 10,979.70, 16,469.55 and 5,147.70 is: 7,721.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,979.70 : 16,469.55 = 5,147.70 : x
  2. Step 2: Convert to fraction form
    10,979.70/16,469.55 = 5,147.70/x
  3. Step 3: Cross multiply
    10,979.70x = 16,469.55 × 5,147.70
  4. Step 4: Simplify right side
    10,979.70x = 84,780,302.54
  5. Step 5: Solve for x
    x = 84,780,302.54/10,979.70
  6. Step 6: Final answer
    x = 7,721.55

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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.