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Finding the Fourth Proportional to 12,819.70, 17,690.82 and 7,154.47

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Solution

The fourth proportional to 12,819.70, 17,690.82 and 7,154.47 is: 9,872.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,819.70 : 17,690.82 = 7,154.47 : x
  2. Step 2: Convert to fraction form
    12,819.70/17,690.82 = 7,154.47/x
  3. Step 3: Cross multiply
    12,819.70x = 17,690.82 × 7,154.47
  4. Step 4: Simplify right side
    12,819.70x = 126,568,440.97
  5. Step 5: Solve for x
    x = 126,568,440.97/12,819.70
  6. Step 6: Final answer
    x = 9,872.96

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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.