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Finding the Fourth Proportional to 48.44, 66.78 and 40.25

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Solution

The fourth proportional to 48.44, 66.78 and 40.25 is: 55.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.44 : 66.78 = 40.25 : x
  2. Step 2: Convert to fraction form
    48.44/66.78 = 40.25/x
  3. Step 3: Cross multiply
    48.44x = 66.78 × 40.25
  4. Step 4: Simplify right side
    48.44x = 2,687.56
  5. Step 5: Solve for x
    x = 2,687.56/48.44
  6. Step 6: Final answer
    x = 55.49

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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.