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Finding the Third Proportional to 38,988 and 85,920

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Solution

The third proportional to 38,988 and 85,920 is: 189,346.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,988 : 85,920 = 85,920 : x
  2. Step 2: Convert to fraction form
    38,988/85,920 = 85,920/x
  3. Step 3: Cross multiply
    38,988x = 85,920 × 85,920
  4. Step 4: Simplify right side
    38,988x = 7,382,246,400
  5. Step 5: Solve for x
    x = 7,382,246,400/38,988
  6. Step 6: Final answer
    x = 189,346.63

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.