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Finding the Third Proportional to 642.38 and 936

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Solution

The third proportional to 642.38 and 936 is: 1,363.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.38 : 936 = 936 : x
  2. Step 2: Convert to fraction form
    642.38/936 = 936/x
  3. Step 3: Cross multiply
    642.38x = 936 × 936
  4. Step 4: Simplify right side
    642.38x = 876,096
  5. Step 5: Solve for x
    x = 876,096/642.38
  6. Step 6: Final answer
    x = 1,363.84

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.