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Finding the Fourth Proportional to 266.88, 399.69 and 129.72

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Solution

The fourth proportional to 266.88, 399.69 and 129.72 is: 194.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.88 : 399.69 = 129.72 : x
  2. Step 2: Convert to fraction form
    266.88/399.69 = 129.72/x
  3. Step 3: Cross multiply
    266.88x = 399.69 × 129.72
  4. Step 4: Simplify right side
    266.88x = 51,847.79
  5. Step 5: Solve for x
    x = 51,847.79/266.88
  6. Step 6: Final answer
    x = 194.27

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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.