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Finding the Fourth Proportional to 266.86, 368.31 and 154.90

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Solution

The fourth proportional to 266.86, 368.31 and 154.90 is: 213.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.86 : 368.31 = 154.90 : x
  2. Step 2: Convert to fraction form
    266.86/368.31 = 154.90/x
  3. Step 3: Cross multiply
    266.86x = 368.31 × 154.90
  4. Step 4: Simplify right side
    266.86x = 57,049.38
  5. Step 5: Solve for x
    x = 57,049.38/266.86
  6. Step 6: Final answer
    x = 213.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.