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Finding the Fourth Proportional to 266.21, 398.89 and 103.80

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Solution

The fourth proportional to 266.21, 398.89 and 103.80 is: 155.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.21 : 398.89 = 103.80 : x
  2. Step 2: Convert to fraction form
    266.21/398.89 = 103.80/x
  3. Step 3: Cross multiply
    266.21x = 398.89 × 103.80
  4. Step 4: Simplify right side
    266.21x = 41,404.78
  5. Step 5: Solve for x
    x = 41,404.78/266.21
  6. Step 6: Final answer
    x = 155.53

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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.