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Finding the Fourth Proportional to 308.15, 462.31 and 91.73

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Solution

The fourth proportional to 308.15, 462.31 and 91.73 is: 137.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.15 : 462.31 = 91.73 : x
  2. Step 2: Convert to fraction form
    308.15/462.31 = 91.73/x
  3. Step 3: Cross multiply
    308.15x = 462.31 × 91.73
  4. Step 4: Simplify right side
    308.15x = 42,407.24
  5. Step 5: Solve for x
    x = 42,407.24/308.15
  6. Step 6: Final answer
    x = 137.62

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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.