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Finding the Third Proportional to 7,120 and 11,656

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Solution

The third proportional to 7,120 and 11,656 is: 19,081.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,120 : 11,656 = 11,656 : x
  2. Step 2: Convert to fraction form
    7,120/11,656 = 11,656/x
  3. Step 3: Cross multiply
    7,120x = 11,656 × 11,656
  4. Step 4: Simplify right side
    7,120x = 135,862,336
  5. Step 5: Solve for x
    x = 135,862,336/7,120
  6. Step 6: Final answer
    x = 19,081.79

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Why These Related Problems?

These problems maintain the same ratio (1.64) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.