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Finding the Fourth Proportional to 308.12, 462.15 and 115.61

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Solution

The fourth proportional to 308.12, 462.15 and 115.61 is: 173.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.12 : 462.15 = 115.61 : x
  2. Step 2: Convert to fraction form
    308.12/462.15 = 115.61/x
  3. Step 3: Cross multiply
    308.12x = 462.15 × 115.61
  4. Step 4: Simplify right side
    308.12x = 53,426.85
  5. Step 5: Solve for x
    x = 53,426.85/308.12
  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.