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Finding the Third Proportional to 9,990 and 11,070

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Solution

The third proportional to 9,990 and 11,070 is: 12,266.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,990 : 11,070 = 11,070 : x
  2. Step 2: Convert to fraction form
    9,990/11,070 = 11,070/x
  3. Step 3: Cross multiply
    9,990x = 11,070 × 11,070
  4. Step 4: Simplify right side
    9,990x = 122,544,900
  5. Step 5: Solve for x
    x = 122,544,900/9,990
  6. Step 6: Final answer
    x = 12,266.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.