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Finding the Third Proportional to 11,688 and 15,420

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Solution

The third proportional to 11,688 and 15,420 is: 20,343.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,688 : 15,420 = 15,420 : x
  2. Step 2: Convert to fraction form
    11,688/15,420 = 15,420/x
  3. Step 3: Cross multiply
    11,688x = 15,420 × 15,420
  4. Step 4: Simplify right side
    11,688x = 237,776,400
  5. Step 5: Solve for x
    x = 237,776,400/11,688
  6. Step 6: Final answer
    x = 20,343.63

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.