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Finding the Third Proportional to 131 and 142

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Solution

The third proportional to 131 and 142 is: 153.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    131 : 142 = 142 : x
  2. Step 2: Convert to fraction form
    131/142 = 142/x
  3. Step 3: Cross multiply
    131x = 142 × 142
  4. Step 4: Simplify right side
    131x = 20,164
  5. Step 5: Solve for x
    x = 20,164/131
  6. Step 6: Final answer
    x = 153.92

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.