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Finding the Fourth Proportional to 12,819.21, 17,691.18 and 7,515.73

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Solution

The fourth proportional to 12,819.21, 17,691.18 and 7,515.73 is: 10,372.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,819.21 : 17,691.18 = 7,515.73 : x
  2. Step 2: Convert to fraction form
    12,819.21/17,691.18 = 7,515.73/x
  3. Step 3: Cross multiply
    12,819.21x = 17,691.18 × 7,515.73
  4. Step 4: Simplify right side
    12,819.21x = 132,962,132.26
  5. Step 5: Solve for x
    x = 132,962,132.26/12,819.21
  6. Step 6: Final answer
    x = 10,372.10

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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.