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Finding the Third Proportional to 7,128 and 11,142

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Solution

The third proportional to 7,128 and 11,142 is: 17,416.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,128 : 11,142 = 11,142 : x
  2. Step 2: Convert to fraction form
    7,128/11,142 = 11,142/x
  3. Step 3: Cross multiply
    7,128x = 11,142 × 11,142
  4. Step 4: Simplify right side
    7,128x = 124,144,164
  5. Step 5: Solve for x
    x = 124,144,164/7,128
  6. Step 6: Final answer
    x = 17,416.41

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.