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Finding the Third Proportional to 489.50 and 869.50

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Solution

The third proportional to 489.50 and 869.50 is: 1,544.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.50 : 869.50 = 869.50 : x
  2. Step 2: Convert to fraction form
    489.50/869.50 = 869.50/x
  3. Step 3: Cross multiply
    489.50x = 869.50 × 869.50
  4. Step 4: Simplify right side
    489.50x = 756,030.25
  5. Step 5: Solve for x
    x = 756,030.25/489.50
  6. Step 6: Final answer
    x = 1,544.49

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.