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Finding the Fourth Proportional to 249.78, 344.72 and 139.27

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Solution

The fourth proportional to 249.78, 344.72 and 139.27 is: 192.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.78 : 344.72 = 139.27 : x
  2. Step 2: Convert to fraction form
    249.78/344.72 = 139.27/x
  3. Step 3: Cross multiply
    249.78x = 344.72 × 139.27
  4. Step 4: Simplify right side
    249.78x = 48,009.29
  5. Step 5: Solve for x
    x = 48,009.29/249.78
  6. Step 6: Final answer
    x = 192.20

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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.