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Finding the Fourth Proportional to 248.81, 343.38 and 138.31

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Solution

The fourth proportional to 248.81, 343.38 and 138.31 is: 190.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.81 : 343.38 = 138.31 : x
  2. Step 2: Convert to fraction form
    248.81/343.38 = 138.31/x
  3. Step 3: Cross multiply
    248.81x = 343.38 × 138.31
  4. Step 4: Simplify right side
    248.81x = 47,493.76
  5. Step 5: Solve for x
    x = 47,493.76/248.81
  6. Step 6: Final answer
    x = 190.88

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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.