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Finding the Third Proportional to 72 and 140.75

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Solution

The third proportional to 72 and 140.75 is: 275.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    72 : 140.75 = 140.75 : x
  2. Step 2: Convert to fraction form
    72/140.75 = 140.75/x
  3. Step 3: Cross multiply
    72x = 140.75 × 140.75
  4. Step 4: Simplify right side
    72x = 19,810.56
  5. Step 5: Solve for x
    x = 19,810.56/72
  6. Step 6: Final answer
    x = 275.15

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Why These Related Problems?

These problems maintain the same ratio (1.95) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.