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Finding the Third Proportional to 4,910 and 7,220

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Solution

The third proportional to 4,910 and 7,220 is: 10,616.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,910 : 7,220 = 7,220 : x
  2. Step 2: Convert to fraction form
    4,910/7,220 = 7,220/x
  3. Step 3: Cross multiply
    4,910x = 7,220 × 7,220
  4. Step 4: Simplify right side
    4,910x = 52,128,400
  5. Step 5: Solve for x
    x = 52,128,400/4,910
  6. Step 6: Final answer
    x = 10,616.78

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.