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Finding the Fourth Proportional to 408.96, 613.28 and 165.36

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Solution

The fourth proportional to 408.96, 613.28 and 165.36 is: 247.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.96 : 613.28 = 165.36 : x
  2. Step 2: Convert to fraction form
    408.96/613.28 = 165.36/x
  3. Step 3: Cross multiply
    408.96x = 613.28 × 165.36
  4. Step 4: Simplify right side
    408.96x = 101,411.98
  5. Step 5: Solve for x
    x = 101,411.98/408.96
  6. Step 6: Final answer
    x = 247.98

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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.