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Finding the Fourth Proportional to 248.79, 343.32 and 138.27

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Solution

The fourth proportional to 248.79, 343.32 and 138.27 is: 190.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.79 : 343.32 = 138.27 : x
  2. Step 2: Convert to fraction form
    248.79/343.32 = 138.27/x
  3. Step 3: Cross multiply
    248.79x = 343.32 × 138.27
  4. Step 4: Simplify right side
    248.79x = 47,470.86
  5. Step 5: Solve for x
    x = 47,470.86/248.79
  6. Step 6: Final answer
    x = 190.81

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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.