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Finding the Fourth Proportional to 308.97, 462.78 and 257.94

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Solution

The fourth proportional to 308.97, 462.78 and 257.94 is: 386.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.97 : 462.78 = 257.94 : x
  2. Step 2: Convert to fraction form
    308.97/462.78 = 257.94/x
  3. Step 3: Cross multiply
    308.97x = 462.78 × 257.94
  4. Step 4: Simplify right side
    308.97x = 119,369.47
  5. Step 5: Solve for x
    x = 119,369.47/308.97
  6. Step 6: Final answer
    x = 386.35

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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.