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Finding the Third Proportional to 57,920 and 87,840

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Solution

The third proportional to 57,920 and 87,840 is: 133,215.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,920 : 87,840 = 87,840 : x
  2. Step 2: Convert to fraction form
    57,920/87,840 = 87,840/x
  3. Step 3: Cross multiply
    57,920x = 87,840 × 87,840
  4. Step 4: Simplify right side
    57,920x = 7,715,865,600
  5. Step 5: Solve for x
    x = 7,715,865,600/57,920
  6. Step 6: Final answer
    x = 133,215.91

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.