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Finding the Fourth Proportional to 48.78, 67.26 and 39.56

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Solution

The fourth proportional to 48.78, 67.26 and 39.56 is: 54.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.78 : 67.26 = 39.56 : x
  2. Step 2: Convert to fraction form
    48.78/67.26 = 39.56/x
  3. Step 3: Cross multiply
    48.78x = 67.26 × 39.56
  4. Step 4: Simplify right side
    48.78x = 2,660.81
  5. Step 5: Solve for x
    x = 2,660.81/48.78
  6. Step 6: Final answer
    x = 54.55

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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.