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Finding the Fourth Proportional to 49.78, 68.48 and 43.92

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Solution

The fourth proportional to 49.78, 68.48 and 43.92 is: 60.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.78 : 68.48 = 43.92 : x
  2. Step 2: Convert to fraction form
    49.78/68.48 = 43.92/x
  3. Step 3: Cross multiply
    49.78x = 68.48 × 43.92
  4. Step 4: Simplify right side
    49.78x = 3,007.64
  5. Step 5: Solve for x
    x = 3,007.64/49.78
  6. Step 6: Final answer
    x = 60.42

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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.