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Finding the Third Proportional to 42 and 77.13

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Solution

The third proportional to 42 and 77.13 is: 141.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    42 : 77.13 = 77.13 : x
  2. Step 2: Convert to fraction form
    42/77.13 = 77.13/x
  3. Step 3: Cross multiply
    42x = 77.13 × 77.13
  4. Step 4: Simplify right side
    42x = 5,948.27
  5. Step 5: Solve for x
    x = 5,948.27/42
  6. Step 6: Final answer
    x = 141.63

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Why These Related Problems?

These problems maintain the same ratio (1.84) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.