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Finding the Fourth Proportional to 266.35, 399.21 and 103.89

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Solution

The fourth proportional to 266.35, 399.21 and 103.89 is: 155.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.35 : 399.21 = 103.89 : x
  2. Step 2: Convert to fraction form
    266.35/399.21 = 103.89/x
  3. Step 3: Cross multiply
    266.35x = 399.21 × 103.89
  4. Step 4: Simplify right side
    266.35x = 41,475.18
  5. Step 5: Solve for x
    x = 41,475.18/266.35
  6. Step 6: Final answer
    x = 155.72

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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.