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Finding the Fourth Proportional to 408.56, 612.88 and 134.73

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Solution

The fourth proportional to 408.56, 612.88 and 134.73 is: 202.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.56 : 612.88 = 134.73 : x
  2. Step 2: Convert to fraction form
    408.56/612.88 = 134.73/x
  3. Step 3: Cross multiply
    408.56x = 612.88 × 134.73
  4. Step 4: Simplify right side
    408.56x = 82,572.99
  5. Step 5: Solve for x
    x = 82,572.99/408.56
  6. Step 6: Final answer
    x = 202.11

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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.