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Finding the Third Proportional to 78 and 142.88

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Solution

The third proportional to 78 and 142.88 is: 261.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    78 : 142.88 = 142.88 : x
  2. Step 2: Convert to fraction form
    78/142.88 = 142.88/x
  3. Step 3: Cross multiply
    78x = 142.88 × 142.88
  4. Step 4: Simplify right side
    78x = 20,413.27
  5. Step 5: Solve for x
    x = 20,413.27/78
  6. Step 6: Final answer
    x = 261.71

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Why These Related Problems?

These problems maintain the same ratio (1.83) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.