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Finding the Third Proportional to 4,722 and 9,929

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Solution

The third proportional to 4,722 and 9,929 is: 20,877.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,722 : 9,929 = 9,929 : x
  2. Step 2: Convert to fraction form
    4,722/9,929 = 9,929/x
  3. Step 3: Cross multiply
    4,722x = 9,929 × 9,929
  4. Step 4: Simplify right side
    4,722x = 98,585,041
  5. Step 5: Solve for x
    x = 98,585,041/4,722
  6. Step 6: Final answer
    x = 20,877.81

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.