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Finding the Third Proportional to 54,780 and 87,090

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Solution

The third proportional to 54,780 and 87,090 is: 138,456.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,780 : 87,090 = 87,090 : x
  2. Step 2: Convert to fraction form
    54,780/87,090 = 87,090/x
  3. Step 3: Cross multiply
    54,780x = 87,090 × 87,090
  4. Step 4: Simplify right side
    54,780x = 7,584,668,100
  5. Step 5: Solve for x
    x = 7,584,668,100/54,780
  6. Step 6: Final answer
    x = 138,456.88

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.