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Finding the Fourth Proportional to 308.78, 463.40 and 171.82

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Solution

The fourth proportional to 308.78, 463.40 and 171.82 is: 257.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.78 : 463.40 = 171.82 : x
  2. Step 2: Convert to fraction form
    308.78/463.40 = 171.82/x
  3. Step 3: Cross multiply
    308.78x = 463.40 × 171.82
  4. Step 4: Simplify right side
    308.78x = 79,618.21
  5. Step 5: Solve for x
    x = 79,618.21/308.78
  6. Step 6: Final answer
    x = 257.85

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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.