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Finding the Fourth Proportional to 408.40, 612.54 and 134.48

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Solution

The fourth proportional to 408.40, 612.54 and 134.48 is: 201.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.40 : 612.54 = 134.48 : x
  2. Step 2: Convert to fraction form
    408.40/612.54 = 134.48/x
  3. Step 3: Cross multiply
    408.40x = 612.54 × 134.48
  4. Step 4: Simplify right side
    408.40x = 82,374.38
  5. Step 5: Solve for x
    x = 82,374.38/408.40
  6. Step 6: Final answer
    x = 201.70

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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.