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Finding the Fourth Proportional to 48.43, 66.78 and 39.18

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Solution

The fourth proportional to 48.43, 66.78 and 39.18 is: 54.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.43 : 66.78 = 39.18 : x
  2. Step 2: Convert to fraction form
    48.43/66.78 = 39.18/x
  3. Step 3: Cross multiply
    48.43x = 66.78 × 39.18
  4. Step 4: Simplify right side
    48.43x = 2,616.44
  5. Step 5: Solve for x
    x = 2,616.44/48.43
  6. Step 6: Final answer
    x = 54.03

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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.