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Finding the Fourth Proportional to 48.48, 66.78 and 40.28

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Solution

The fourth proportional to 48.48, 66.78 and 40.28 is: 55.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.48 : 66.78 = 40.28 : x
  2. Step 2: Convert to fraction form
    48.48/66.78 = 40.28/x
  3. Step 3: Cross multiply
    48.48x = 66.78 × 40.28
  4. Step 4: Simplify right side
    48.48x = 2,689.56
  5. Step 5: Solve for x
    x = 2,689.56/48.48
  6. Step 6: Final answer
    x = 55.48

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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.