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Finding the Third Proportional to 620.75 and 913.69

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Solution

The third proportional to 620.75 and 913.69 is: 1,344.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.75 : 913.69 = 913.69 : x
  2. Step 2: Convert to fraction form
    620.75/913.69 = 913.69/x
  3. Step 3: Cross multiply
    620.75x = 913.69 × 913.69
  4. Step 4: Simplify right side
    620.75x = 834,824.85
  5. Step 5: Solve for x
    x = 834,824.85/620.75
  6. Step 6: Final answer
    x = 1,344.86

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.