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Finding the Fourth Proportional to 266.77, 400.12 and 198.39

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Solution

The fourth proportional to 266.77, 400.12 and 198.39 is: 297.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.77 : 400.12 = 198.39 : x
  2. Step 2: Convert to fraction form
    266.77/400.12 = 198.39/x
  3. Step 3: Cross multiply
    266.77x = 400.12 × 198.39
  4. Step 4: Simplify right side
    266.77x = 79,379.81
  5. Step 5: Solve for x
    x = 79,379.81/266.77
  6. Step 6: Final answer
    x = 297.56

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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.