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Finding the Fourth Proportional to 408.10, 612.15 and 115.60

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Solution

The fourth proportional to 408.10, 612.15 and 115.60 is: 173.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.10 : 612.15 = 115.60 : x
  2. Step 2: Convert to fraction form
    408.10/612.15 = 115.60/x
  3. Step 3: Cross multiply
    408.10x = 612.15 × 115.60
  4. Step 4: Simplify right side
    408.10x = 70,764.54
  5. Step 5: Solve for x
    x = 70,764.54/408.10
  6. Step 6: Final answer
    x = 173.40

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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.