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Finding the Third Proportional to 391.50 and 741.75

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Solution

The third proportional to 391.50 and 741.75 is: 1,405.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.50 : 741.75 = 741.75 : x
  2. Step 2: Convert to fraction form
    391.50/741.75 = 741.75/x
  3. Step 3: Cross multiply
    391.50x = 741.75 × 741.75
  4. Step 4: Simplify right side
    391.50x = 550,193.06
  5. Step 5: Solve for x
    x = 550,193.06/391.50
  6. Step 6: Final answer
    x = 1,405.35

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Why These Related Problems?

These problems maintain the same ratio (1.89) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.