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Finding the Fourth Proportional to 18,921.60, 28,377.84 and 8,385.78

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Solution

The fourth proportional to 18,921.60, 28,377.84 and 8,385.78 is: 12,576.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,921.60 : 28,377.84 = 8,385.78 : x
  2. Step 2: Convert to fraction form
    18,921.60/28,377.84 = 8,385.78/x
  3. Step 3: Cross multiply
    18,921.60x = 28,377.84 × 8,385.78
  4. Step 4: Simplify right side
    18,921.60x = 237,970,323.12
  5. Step 5: Solve for x
    x = 237,970,323.12/18,921.60
  6. Step 6: Final answer
    x = 12,576.65

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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.