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Finding the Fourth Proportional to 408.90, 612.97 and 165.25

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Solution

The fourth proportional to 408.90, 612.97 and 165.25 is: 247.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.90 : 612.97 = 165.25 : x
  2. Step 2: Convert to fraction form
    408.90/612.97 = 165.25/x
  3. Step 3: Cross multiply
    408.90x = 612.97 × 165.25
  4. Step 4: Simplify right side
    408.90x = 101,293.29
  5. Step 5: Solve for x
    x = 101,293.29/408.90
  6. Step 6: Final answer
    x = 247.72

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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.