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Finding the Third Proportional to 15,120 and 21,708

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Solution

The third proportional to 15,120 and 21,708 is: 31,166.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,120 : 21,708 = 21,708 : x
  2. Step 2: Convert to fraction form
    15,120/21,708 = 21,708/x
  3. Step 3: Cross multiply
    15,120x = 21,708 × 21,708
  4. Step 4: Simplify right side
    15,120x = 471,237,264
  5. Step 5: Solve for x
    x = 471,237,264/15,120
  6. Step 6: Final answer
    x = 31,166.49

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Why These Related Problems?

These problems maintain the same ratio (1.44) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.