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Finding the Third Proportional to 5,305 and 9,920

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Solution

The third proportional to 5,305 and 9,920 is: 18,549.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,305 : 9,920 = 9,920 : x
  2. Step 2: Convert to fraction form
    5,305/9,920 = 9,920/x
  3. Step 3: Cross multiply
    5,305x = 9,920 × 9,920
  4. Step 4: Simplify right side
    5,305x = 98,406,400
  5. Step 5: Solve for x
    x = 98,406,400/5,305
  6. Step 6: Final answer
    x = 18,549.75

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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.