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Finding the Third Proportional to 688 and 1,650

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Solution

The third proportional to 688 and 1,650 is: 3,957.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    688 : 1,650 = 1,650 : x
  2. Step 2: Convert to fraction form
    688/1,650 = 1,650/x
  3. Step 3: Cross multiply
    688x = 1,650 × 1,650
  4. Step 4: Simplify right side
    688x = 2,722,500
  5. Step 5: Solve for x
    x = 2,722,500/688
  6. Step 6: Final answer
    x = 3,957.12

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Why These Related Problems?

These problems maintain the same ratio (2.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.