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Finding the Third Proportional to 15,390 and 21,924

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Solution

The third proportional to 15,390 and 21,924 is: 31,232.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,390 : 21,924 = 21,924 : x
  2. Step 2: Convert to fraction form
    15,390/21,924 = 21,924/x
  3. Step 3: Cross multiply
    15,390x = 21,924 × 21,924
  4. Step 4: Simplify right side
    15,390x = 480,661,776
  5. Step 5: Solve for x
    x = 480,661,776/15,390
  6. Step 6: Final answer
    x = 31,232.08

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.