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Finding the Fourth Proportional to 266.86, 400.38 and 112.78

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Solution

The fourth proportional to 266.86, 400.38 and 112.78 is: 169.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.86 : 400.38 = 112.78 : x
  2. Step 2: Convert to fraction form
    266.86/400.38 = 112.78/x
  3. Step 3: Cross multiply
    266.86x = 400.38 × 112.78
  4. Step 4: Simplify right side
    266.86x = 45,154.86
  5. Step 5: Solve for x
    x = 45,154.86/266.86
  6. Step 6: Final answer
    x = 169.21

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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.