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Finding the Third Proportional to 21,678.75 and 28,995.75

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Solution

The third proportional to 21,678.75 and 28,995.75 is: 38,782.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,678.75 : 28,995.75 = 28,995.75 : x
  2. Step 2: Convert to fraction form
    21,678.75/28,995.75 = 28,995.75/x
  3. Step 3: Cross multiply
    21,678.75x = 28,995.75 × 28,995.75
  4. Step 4: Simplify right side
    21,678.75x = 840,753,518.06
  5. Step 5: Solve for x
    x = 840,753,518.06/21,678.75
  6. Step 6: Final answer
    x = 38,782.38

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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.