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Finding the Fourth Proportional to 427.07, 640.60 and 149.42

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Solution

The fourth proportional to 427.07, 640.60 and 149.42 is: 224.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.07 : 640.60 = 149.42 : x
  2. Step 2: Convert to fraction form
    427.07/640.60 = 149.42/x
  3. Step 3: Cross multiply
    427.07x = 640.60 × 149.42
  4. Step 4: Simplify right side
    427.07x = 95,719.68
  5. Step 5: Solve for x
    x = 95,719.68/427.07
  6. Step 6: Final answer
    x = 224.13

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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.