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Finding the Fourth Proportional to 266.61, 399.96 and 104.21

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Solution

The fourth proportional to 266.61, 399.96 and 104.21 is: 156.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.61 : 399.96 = 104.21 : x
  2. Step 2: Convert to fraction form
    266.61/399.96 = 104.21/x
  3. Step 3: Cross multiply
    266.61x = 399.96 × 104.21
  4. Step 4: Simplify right side
    266.61x = 41,677.83
  5. Step 5: Solve for x
    x = 41,677.83/266.61
  6. Step 6: Final answer
    x = 156.33

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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.