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Finding the Third Proportional to 630.19 and 979.78

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Solution

The third proportional to 630.19 and 979.78 is: 1,523.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.19 : 979.78 = 979.78 : x
  2. Step 2: Convert to fraction form
    630.19/979.78 = 979.78/x
  3. Step 3: Cross multiply
    630.19x = 979.78 × 979.78
  4. Step 4: Simplify right side
    630.19x = 959,971.30
  5. Step 5: Solve for x
    x = 959,971.30/630.19
  6. Step 6: Final answer
    x = 1,523.31

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.