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Finding the Third Proportional to 7,200 and 11,120

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Solution

The third proportional to 7,200 and 11,120 is: 17,174.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,200 : 11,120 = 11,120 : x
  2. Step 2: Convert to fraction form
    7,200/11,120 = 11,120/x
  3. Step 3: Cross multiply
    7,200x = 11,120 × 11,120
  4. Step 4: Simplify right side
    7,200x = 123,654,400
  5. Step 5: Solve for x
    x = 123,654,400/7,200
  6. Step 6: Final answer
    x = 17,174.22

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.