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Finding the Fourth Proportional to 423.30, 634.74 and 149.31

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Solution

The fourth proportional to 423.30, 634.74 and 149.31 is: 223.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.30 : 634.74 = 149.31 : x
  2. Step 2: Convert to fraction form
    423.30/634.74 = 149.31/x
  3. Step 3: Cross multiply
    423.30x = 634.74 × 149.31
  4. Step 4: Simplify right side
    423.30x = 94,773.03
  5. Step 5: Solve for x
    x = 94,773.03/423.30
  6. Step 6: Final answer
    x = 223.89

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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.