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Finding the Fourth Proportional to 18,761.60, 28,138.35 and 8,231.60

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Solution

The fourth proportional to 18,761.60, 28,138.35 and 8,231.60 is: 12,345.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.60 : 28,138.35 = 8,231.60 : x
  2. Step 2: Convert to fraction form
    18,761.60/28,138.35 = 8,231.60/x
  3. Step 3: Cross multiply
    18,761.60x = 28,138.35 × 8,231.60
  4. Step 4: Simplify right side
    18,761.60x = 231,623,641.86
  5. Step 5: Solve for x
    x = 231,623,641.86/18,761.60
  6. Step 6: Final answer
    x = 12,345.62

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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.