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Finding the Fourth Proportional to 248.91, 343.48 and 138.38

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Solution

The fourth proportional to 248.91, 343.48 and 138.38 is: 190.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.91 : 343.48 = 138.38 : x
  2. Step 2: Convert to fraction form
    248.91/343.48 = 138.38/x
  3. Step 3: Cross multiply
    248.91x = 343.48 × 138.38
  4. Step 4: Simplify right side
    248.91x = 47,530.76
  5. Step 5: Solve for x
    x = 47,530.76/248.91
  6. Step 6: Final answer
    x = 190.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.