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Finding the Third Proportional to 28,890 and 61,686

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Solution

The third proportional to 28,890 and 61,686 is: 131,712.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,890 : 61,686 = 61,686 : x
  2. Step 2: Convert to fraction form
    28,890/61,686 = 61,686/x
  3. Step 3: Cross multiply
    28,890x = 61,686 × 61,686
  4. Step 4: Simplify right side
    28,890x = 3,805,162,596
  5. Step 5: Solve for x
    x = 3,805,162,596/28,890
  6. Step 6: Final answer
    x = 131,712.10

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.