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Finding the Fourth Proportional to 12,819.88, 17,691.43 and 7,230.88

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Solution

The fourth proportional to 12,819.88, 17,691.43 and 7,230.88 is: 9,978.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,819.88 : 17,691.43 = 7,230.88 : x
  2. Step 2: Convert to fraction form
    12,819.88/17,691.43 = 7,230.88/x
  3. Step 3: Cross multiply
    12,819.88x = 17,691.43 × 7,230.88
  4. Step 4: Simplify right side
    12,819.88x = 127,924,571.20
  5. Step 5: Solve for x
    x = 127,924,571.20/12,819.88
  6. Step 6: Final answer
    x = 9,978.61

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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.