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Finding the Third Proportional to 120,789 and 169,920

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Solution

The third proportional to 120,789 and 169,920 is: 239,035.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,789 : 169,920 = 169,920 : x
  2. Step 2: Convert to fraction form
    120,789/169,920 = 169,920/x
  3. Step 3: Cross multiply
    120,789x = 169,920 × 169,920
  4. Step 4: Simplify right side
    120,789x = 28,872,806,400
  5. Step 5: Solve for x
    x = 28,872,806,400/120,789
  6. Step 6: Final answer
    x = 239,035.06

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.