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Finding the Fourth Proportional to 18,748.20, 28,122.30 and 12,843.30

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Solution

The fourth proportional to 18,748.20, 28,122.30 and 12,843.30 is: 19,264.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,748.20 : 28,122.30 = 12,843.30 : x
  2. Step 2: Convert to fraction form
    18,748.20/28,122.30 = 12,843.30/x
  3. Step 3: Cross multiply
    18,748.20x = 28,122.30 × 12,843.30
  4. Step 4: Simplify right side
    18,748.20x = 361,183,135.59
  5. Step 5: Solve for x
    x = 361,183,135.59/18,748.20
  6. Step 6: Final answer
    x = 19,264.95

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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.