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Finding the Third Proportional to 486.75 and 910.78

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Solution

The third proportional to 486.75 and 910.78 is: 1,704.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.75 : 910.78 = 910.78 : x
  2. Step 2: Convert to fraction form
    486.75/910.78 = 910.78/x
  3. Step 3: Cross multiply
    486.75x = 910.78 × 910.78
  4. Step 4: Simplify right side
    486.75x = 829,522.49
  5. Step 5: Solve for x
    x = 829,522.49/486.75
  6. Step 6: Final answer
    x = 1,704.21

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Why These Related Problems?

These problems maintain the same ratio (1.87) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.