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Finding the Fourth Proportional to 308.57, 462.87 and 92.15

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Solution

The fourth proportional to 308.57, 462.87 and 92.15 is: 138.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.57 : 462.87 = 92.15 : x
  2. Step 2: Convert to fraction form
    308.57/462.87 = 92.15/x
  3. Step 3: Cross multiply
    308.57x = 462.87 × 92.15
  4. Step 4: Simplify right side
    308.57x = 42,653.47
  5. Step 5: Solve for x
    x = 42,653.47/308.57
  6. Step 6: Final answer
    x = 138.23

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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.