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Finding the Third Proportional to 647 and 708

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Solution

The third proportional to 647 and 708 is: 774.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    647 : 708 = 708 : x
  2. Step 2: Convert to fraction form
    647/708 = 708/x
  3. Step 3: Cross multiply
    647x = 708 × 708
  4. Step 4: Simplify right side
    647x = 501,264
  5. Step 5: Solve for x
    x = 501,264/647
  6. Step 6: Final answer
    x = 774.75

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.