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Finding the Third Proportional to 644 and 902.50

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Solution

The third proportional to 644 and 902.50 is: 1,264.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    644 : 902.50 = 902.50 : x
  2. Step 2: Convert to fraction form
    644/902.50 = 902.50/x
  3. Step 3: Cross multiply
    644x = 902.50 × 902.50
  4. Step 4: Simplify right side
    644x = 814,506.25
  5. Step 5: Solve for x
    x = 814,506.25/644
  6. Step 6: Final answer
    x = 1,264.76

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.