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Finding the Fourth Proportional to 266.72, 398.88 and 218.24

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Solution

The fourth proportional to 266.72, 398.88 and 218.24 is: 326.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.72 : 398.88 = 218.24 : x
  2. Step 2: Convert to fraction form
    266.72/398.88 = 218.24/x
  3. Step 3: Cross multiply
    266.72x = 398.88 × 218.24
  4. Step 4: Simplify right side
    266.72x = 87,051.57
  5. Step 5: Solve for x
    x = 87,051.57/266.72
  6. Step 6: Final answer
    x = 326.38

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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.