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Finding the Fourth Proportional to 266.22, 399.18 and 189.66

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Solution

The fourth proportional to 266.22, 399.18 and 189.66 is: 284.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.22 : 399.18 = 189.66 : x
  2. Step 2: Convert to fraction form
    266.22/399.18 = 189.66/x
  3. Step 3: Cross multiply
    266.22x = 399.18 × 189.66
  4. Step 4: Simplify right side
    266.22x = 75,708.48
  5. Step 5: Solve for x
    x = 75,708.48/266.22
  6. Step 6: Final answer
    x = 284.38

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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.