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Finding the Fourth Proportional to 12,910.32, 17,817.12 and 7,321.68

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Solution

The fourth proportional to 12,910.32, 17,817.12 and 7,321.68 is: 10,104.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,910.32 : 17,817.12 = 7,321.68 : x
  2. Step 2: Convert to fraction form
    12,910.32/17,817.12 = 7,321.68/x
  3. Step 3: Cross multiply
    12,910.32x = 17,817.12 × 7,321.68
  4. Step 4: Simplify right side
    12,910.32x = 130,451,251.16
  5. Step 5: Solve for x
    x = 130,451,251.16/12,910.32
  6. Step 6: Final answer
    x = 10,104.42

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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.