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Finding the Third Proportional to 381.75 and 830.53

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Solution

The third proportional to 381.75 and 830.53 is: 1,806.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.75 : 830.53 = 830.53 : x
  2. Step 2: Convert to fraction form
    381.75/830.53 = 830.53/x
  3. Step 3: Cross multiply
    381.75x = 830.53 × 830.53
  4. Step 4: Simplify right side
    381.75x = 689,782.16
  5. Step 5: Solve for x
    x = 689,782.16/381.75
  6. Step 6: Final answer
    x = 1,806.89

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.