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Finding the Third Proportional to 402.50 and 617.75

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Solution

The third proportional to 402.50 and 617.75 is: 948.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.50 : 617.75 = 617.75 : x
  2. Step 2: Convert to fraction form
    402.50/617.75 = 617.75/x
  3. Step 3: Cross multiply
    402.50x = 617.75 × 617.75
  4. Step 4: Simplify right side
    402.50x = 381,615.06
  5. Step 5: Solve for x
    x = 381,615.06/402.50
  6. Step 6: Final answer
    x = 948.11

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.