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Finding the Third Proportional to 319.25 and 689.45

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Solution

The third proportional to 319.25 and 689.45 is: 1,488.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.25 : 689.45 = 689.45 : x
  2. Step 2: Convert to fraction form
    319.25/689.45 = 689.45/x
  3. Step 3: Cross multiply
    319.25x = 689.45 × 689.45
  4. Step 4: Simplify right side
    319.25x = 475,340.23
  5. Step 5: Solve for x
    x = 475,340.23/319.25
  6. Step 6: Final answer
    x = 1,488.91

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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.