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Finding the Fourth Proportional to 423.31, 635.25 and 149.40

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Solution

The fourth proportional to 423.31, 635.25 and 149.40 is: 224.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.31 : 635.25 = 149.40 : x
  2. Step 2: Convert to fraction form
    423.31/635.25 = 149.40/x
  3. Step 3: Cross multiply
    423.31x = 635.25 × 149.40
  4. Step 4: Simplify right side
    423.31x = 94,906.35
  5. Step 5: Solve for x
    x = 94,906.35/423.31
  6. Step 6: Final answer
    x = 224.20

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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.