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Finding the Third Proportional to 206,440 and 290,715

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Solution

The third proportional to 206,440 and 290,715 is: 409,393.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,440 : 290,715 = 290,715 : x
  2. Step 2: Convert to fraction form
    206,440/290,715 = 290,715/x
  3. Step 3: Cross multiply
    206,440x = 290,715 × 290,715
  4. Step 4: Simplify right side
    206,440x = 84,515,211,225
  5. Step 5: Solve for x
    x = 84,515,211,225/206,440
  6. Step 6: Final answer
    x = 409,393.58

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.