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Finding the Third Proportional to 15,684 and 21,984

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Solution

The third proportional to 15,684 and 21,984 is: 30,814.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,684 : 21,984 = 21,984 : x
  2. Step 2: Convert to fraction form
    15,684/21,984 = 21,984/x
  3. Step 3: Cross multiply
    15,684x = 21,984 × 21,984
  4. Step 4: Simplify right side
    15,684x = 483,296,256
  5. Step 5: Solve for x
    x = 483,296,256/15,684
  6. Step 6: Final answer
    x = 30,814.60

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.