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Finding the Fourth Proportional to 18,781.60, 28,175.80 and 8,920.80

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Solution

The fourth proportional to 18,781.60, 28,175.80 and 8,920.80 is: 13,382.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,781.60 : 28,175.80 = 8,920.80 : x
  2. Step 2: Convert to fraction form
    18,781.60/28,175.80 = 8,920.80/x
  3. Step 3: Cross multiply
    18,781.60x = 28,175.80 × 8,920.80
  4. Step 4: Simplify right side
    18,781.60x = 251,350,676.64
  5. Step 5: Solve for x
    x = 251,350,676.64/18,781.60
  6. Step 6: Final answer
    x = 13,382.81

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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.