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Finding the Third Proportional to 669.38 and 979.88

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Solution

The third proportional to 669.38 and 979.88 is: 1,434.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.38 : 979.88 = 979.88 : x
  2. Step 2: Convert to fraction form
    669.38/979.88 = 979.88/x
  3. Step 3: Cross multiply
    669.38x = 979.88 × 979.88
  4. Step 4: Simplify right side
    669.38x = 960,155.02
  5. Step 5: Solve for x
    x = 960,155.02/669.38
  6. Step 6: Final answer
    x = 1,434.41

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.