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Finding the Third Proportional to 391.50 and 609.19

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Solution

The third proportional to 391.50 and 609.19 is: 947.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.50 : 609.19 = 609.19 : x
  2. Step 2: Convert to fraction form
    391.50/609.19 = 609.19/x
  3. Step 3: Cross multiply
    391.50x = 609.19 × 609.19
  4. Step 4: Simplify right side
    391.50x = 371,109.41
  5. Step 5: Solve for x
    x = 371,109.41/391.50
  6. Step 6: Final answer
    x = 947.92

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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.