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Finding the Third Proportional to 21,240 and 28,368

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Solution

The third proportional to 21,240 and 28,368 is: 37,888.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,240 : 28,368 = 28,368 : x
  2. Step 2: Convert to fraction form
    21,240/28,368 = 28,368/x
  3. Step 3: Cross multiply
    21,240x = 28,368 × 28,368
  4. Step 4: Simplify right side
    21,240x = 804,743,424
  5. Step 5: Solve for x
    x = 804,743,424/21,240
  6. Step 6: Final answer
    x = 37,888.11

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.