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Finding the Third Proportional to 142.38 and 318.94

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Solution

The third proportional to 142.38 and 318.94 is: 714.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.38 : 318.94 = 318.94 : x
  2. Step 2: Convert to fraction form
    142.38/318.94 = 318.94/x
  3. Step 3: Cross multiply
    142.38x = 318.94 × 318.94
  4. Step 4: Simplify right side
    142.38x = 101,721.13
  5. Step 5: Solve for x
    x = 101,721.13/142.38
  6. Step 6: Final answer
    x = 714.42

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Why These Related Problems?

These problems maintain the same ratio (2.24) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.