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Finding the Third Proportional to 639.50 and 785

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Solution

The third proportional to 639.50 and 785 is: 963.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.50 : 785 = 785 : x
  2. Step 2: Convert to fraction form
    639.50/785 = 785/x
  3. Step 3: Cross multiply
    639.50x = 785 × 785
  4. Step 4: Simplify right side
    639.50x = 616,225
  5. Step 5: Solve for x
    x = 616,225/639.50
  6. Step 6: Final answer
    x = 963.60

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Why These Related Problems?

These problems maintain the same ratio (1.23) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.