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Finding the Fourth Proportional to 248.71, 343.21 and 138.19

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Solution

The fourth proportional to 248.71, 343.21 and 138.19 is: 190.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.71 : 343.21 = 138.19 : x
  2. Step 2: Convert to fraction form
    248.71/343.21 = 138.19/x
  3. Step 3: Cross multiply
    248.71x = 343.21 × 138.19
  4. Step 4: Simplify right side
    248.71x = 47,428.19
  5. Step 5: Solve for x
    x = 47,428.19/248.71
  6. Step 6: Final answer
    x = 190.70

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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.