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Finding the Third Proportional to 638.30 and 993.94

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Solution

The third proportional to 638.30 and 993.94 is: 1,547.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.30 : 993.94 = 993.94 : x
  2. Step 2: Convert to fraction form
    638.30/993.94 = 993.94/x
  3. Step 3: Cross multiply
    638.30x = 993.94 × 993.94
  4. Step 4: Simplify right side
    638.30x = 987,911.75
  5. Step 5: Solve for x
    x = 987,911.75/638.30
  6. Step 6: Final answer
    x = 1,547.73

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.