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Finding the Fourth Proportional to 266, 399.18 and 129.16

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Solution

The fourth proportional to 266, 399.18 and 129.16 is: 193.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    266 : 399.18 = 129.16 : x
  2. Step 2: Convert to fraction form
    266/399.18 = 129.16/x
  3. Step 3: Cross multiply
    266x = 399.18 × 129.16
  4. Step 4: Simplify right side
    266x = 51,558.09
  5. Step 5: Solve for x
    x = 51,558.09/266
  6. Step 6: Final answer
    x = 193.83

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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.