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Finding the Third Proportional to 39,780 and 53,828

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Solution

The third proportional to 39,780 and 53,828 is: 72,836.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,780 : 53,828 = 53,828 : x
  2. Step 2: Convert to fraction form
    39,780/53,828 = 53,828/x
  3. Step 3: Cross multiply
    39,780x = 53,828 × 53,828
  4. Step 4: Simplify right side
    39,780x = 2,897,453,584
  5. Step 5: Solve for x
    x = 2,897,453,584/39,780
  6. Step 6: Final answer
    x = 72,836.94

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.