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Finding the Fourth Proportional to 308.31, 462.15 and 135

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Solution

The fourth proportional to 308.31, 462.15 and 135 is: 202.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.31 : 462.15 = 135 : x
  2. Step 2: Convert to fraction form
    308.31/462.15 = 135/x
  3. Step 3: Cross multiply
    308.31x = 462.15 × 135
  4. Step 4: Simplify right side
    308.31x = 62,390.25
  5. Step 5: Solve for x
    x = 62,390.25/308.31
  6. Step 6: Final answer
    x = 202.36

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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.