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Finding the Third Proportional to 4,940 and 7,215

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Solution

The third proportional to 4,940 and 7,215 is: 10,537.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,940 : 7,215 = 7,215 : x
  2. Step 2: Convert to fraction form
    4,940/7,215 = 7,215/x
  3. Step 3: Cross multiply
    4,940x = 7,215 × 7,215
  4. Step 4: Simplify right side
    4,940x = 52,056,225
  5. Step 5: Solve for x
    x = 52,056,225/4,940
  6. Step 6: Final answer
    x = 10,537.70

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.