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Finding the Third Proportional to 609.40 and 931.18

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Solution

The third proportional to 609.40 and 931.18 is: 1,422.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.40 : 931.18 = 931.18 : x
  2. Step 2: Convert to fraction form
    609.40/931.18 = 931.18/x
  3. Step 3: Cross multiply
    609.40x = 931.18 × 931.18
  4. Step 4: Simplify right side
    609.40x = 867,102.89
  5. Step 5: Solve for x
    x = 867,102.89/609.40
  6. Step 6: Final answer
    x = 1,422.88

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.