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Finding the Third Proportional to 316.50 and 489.38

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Solution

The third proportional to 316.50 and 489.38 is: 756.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.50 : 489.38 = 489.38 : x
  2. Step 2: Convert to fraction form
    316.50/489.38 = 489.38/x
  3. Step 3: Cross multiply
    316.50x = 489.38 × 489.38
  4. Step 4: Simplify right side
    316.50x = 239,487.89
  5. Step 5: Solve for x
    x = 239,487.89/316.50
  6. Step 6: Final answer
    x = 756.68

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.