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Finding the Third Proportional to 688 and 1,488

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Solution

The third proportional to 688 and 1,488 is: 3,218.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    688 : 1,488 = 1,488 : x
  2. Step 2: Convert to fraction form
    688/1,488 = 1,488/x
  3. Step 3: Cross multiply
    688x = 1,488 × 1,488
  4. Step 4: Simplify right side
    688x = 2,214,144
  5. Step 5: Solve for x
    x = 2,214,144/688
  6. Step 6: Final answer
    x = 3,218.23

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.