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Finding the Fourth Proportional to 427.42, 641.11 and 149.76

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Solution

The fourth proportional to 427.42, 641.11 and 149.76 is: 224.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.42 : 641.11 = 149.76 : x
  2. Step 2: Convert to fraction form
    427.42/641.11 = 149.76/x
  3. Step 3: Cross multiply
    427.42x = 641.11 × 149.76
  4. Step 4: Simplify right side
    427.42x = 96,008.68
  5. Step 5: Solve for x
    x = 96,008.68/427.42
  6. Step 6: Final answer
    x = 224.62

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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.