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Finding the Third Proportional to 5,190 and 9,900

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Solution

The third proportional to 5,190 and 9,900 is: 18,884.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,190 : 9,900 = 9,900 : x
  2. Step 2: Convert to fraction form
    5,190/9,900 = 9,900/x
  3. Step 3: Cross multiply
    5,190x = 9,900 × 9,900
  4. Step 4: Simplify right side
    5,190x = 98,010,000
  5. Step 5: Solve for x
    x = 98,010,000/5,190
  6. Step 6: Final answer
    x = 18,884.39

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Why These Related Problems?

These problems maintain the same ratio (1.91) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.