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Finding the Fourth Proportional to 18,781.44, 28,174.32 and 10,990.32

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Solution

The fourth proportional to 18,781.44, 28,174.32 and 10,990.32 is: 16,486.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,781.44 : 28,174.32 = 10,990.32 : x
  2. Step 2: Convert to fraction form
    18,781.44/28,174.32 = 10,990.32/x
  3. Step 3: Cross multiply
    18,781.44x = 28,174.32 × 10,990.32
  4. Step 4: Simplify right side
    18,781.44x = 309,644,792.58
  5. Step 5: Solve for x
    x = 309,644,792.58/18,781.44
  6. Step 6: Final answer
    x = 16,486.74

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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.