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Finding the Fourth Proportional to 25,819.80, 38,729.70 and 12,697.80

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Solution

The fourth proportional to 25,819.80, 38,729.70 and 12,697.80 is: 19,046.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,819.80 : 38,729.70 = 12,697.80 : x
  2. Step 2: Convert to fraction form
    25,819.80/38,729.70 = 12,697.80/x
  3. Step 3: Cross multiply
    25,819.80x = 38,729.70 × 12,697.80
  4. Step 4: Simplify right side
    25,819.80x = 491,781,984.66
  5. Step 5: Solve for x
    x = 491,781,984.66/25,819.80
  6. Step 6: Final answer
    x = 19,046.70

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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.