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Finding the Fourth Proportional to 249, 343.56 and 138.42

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Solution

The fourth proportional to 249, 343.56 and 138.42 is: 190.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    249 : 343.56 = 138.42 : x
  2. Step 2: Convert to fraction form
    249/343.56 = 138.42/x
  3. Step 3: Cross multiply
    249x = 343.56 × 138.42
  4. Step 4: Simplify right side
    249x = 47,555.58
  5. Step 5: Solve for x
    x = 47,555.58/249
  6. Step 6: Final answer
    x = 190.99

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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.