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Finding the Fourth Proportional to 266.23, 399.34 and 81.13

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Solution

The fourth proportional to 266.23, 399.34 and 81.13 is: 121.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.23 : 399.34 = 81.13 : x
  2. Step 2: Convert to fraction form
    266.23/399.34 = 81.13/x
  3. Step 3: Cross multiply
    266.23x = 399.34 × 81.13
  4. Step 4: Simplify right side
    266.23x = 32,399.45
  5. Step 5: Solve for x
    x = 32,399.45/266.23
  6. Step 6: Final answer
    x = 121.70

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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.