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Finding the Third Proportional to 10,728 and 15,090

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Solution

The third proportional to 10,728 and 15,090 is: 21,225.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,728 : 15,090 = 15,090 : x
  2. Step 2: Convert to fraction form
    10,728/15,090 = 15,090/x
  3. Step 3: Cross multiply
    10,728x = 15,090 × 15,090
  4. Step 4: Simplify right side
    10,728x = 227,708,100
  5. Step 5: Solve for x
    x = 227,708,100/10,728
  6. Step 6: Final answer
    x = 21,225.59

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.