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Finding the Third Proportional to 148.78 and 240.19

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Solution

The third proportional to 148.78 and 240.19 is: 387.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.78 : 240.19 = 240.19 : x
  2. Step 2: Convert to fraction form
    148.78/240.19 = 240.19/x
  3. Step 3: Cross multiply
    148.78x = 240.19 × 240.19
  4. Step 4: Simplify right side
    148.78x = 57,690.04
  5. Step 5: Solve for x
    x = 57,690.04/148.78
  6. Step 6: Final answer
    x = 387.75

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.