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Finding the Third Proportional to 489.50 and 646.75

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Solution

The third proportional to 489.50 and 646.75 is: 854.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.50 : 646.75 = 646.75 : x
  2. Step 2: Convert to fraction form
    489.50/646.75 = 646.75/x
  3. Step 3: Cross multiply
    489.50x = 646.75 × 646.75
  4. Step 4: Simplify right side
    489.50x = 418,285.56
  5. Step 5: Solve for x
    x = 418,285.56/489.50
  6. Step 6: Final answer
    x = 854.52

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.