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Finding the Third Proportional to 869.25 and 1,920

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Solution

The third proportional to 869.25 and 1,920 is: 4,240.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.25 : 1,920 = 1,920 : x
  2. Step 2: Convert to fraction form
    869.25/1,920 = 1,920/x
  3. Step 3: Cross multiply
    869.25x = 1,920 × 1,920
  4. Step 4: Simplify right side
    869.25x = 3,686,400
  5. Step 5: Solve for x
    x = 3,686,400/869.25
  6. Step 6: Final answer
    x = 4,240.90

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.