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Finding the Third Proportional to 38,672 and 81,920

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Solution

The third proportional to 38,672 and 81,920 is: 173,533.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,672 : 81,920 = 81,920 : x
  2. Step 2: Convert to fraction form
    38,672/81,920 = 81,920/x
  3. Step 3: Cross multiply
    38,672x = 81,920 × 81,920
  4. Step 4: Simplify right side
    38,672x = 6,710,886,400
  5. Step 5: Solve for x
    x = 6,710,886,400/38,672
  6. Step 6: Final answer
    x = 173,533.47

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.