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Finding the Third Proportional to 128,979 and 172,020

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Solution

The third proportional to 128,979 and 172,020 is: 229,424.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,979 : 172,020 = 172,020 : x
  2. Step 2: Convert to fraction form
    128,979/172,020 = 172,020/x
  3. Step 3: Cross multiply
    128,979x = 172,020 × 172,020
  4. Step 4: Simplify right side
    128,979x = 29,590,880,400
  5. Step 5: Solve for x
    x = 29,590,880,400/128,979
  6. Step 6: Final answer
    x = 229,424.02

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.