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Finding the Fourth Proportional to 248.69, 343.20 and 143.78

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Solution

The fourth proportional to 248.69, 343.20 and 143.78 is: 198.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.69 : 343.20 = 143.78 : x
  2. Step 2: Convert to fraction form
    248.69/343.20 = 143.78/x
  3. Step 3: Cross multiply
    248.69x = 343.20 × 143.78
  4. Step 4: Simplify right side
    248.69x = 49,345.61
  5. Step 5: Solve for x
    x = 49,345.61/248.69
  6. Step 6: Final answer
    x = 198.42

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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.