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Finding the Third Proportional to 128,874 and 189,072

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Solution

The third proportional to 128,874 and 189,072 is: 277,388.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,874 : 189,072 = 189,072 : x
  2. Step 2: Convert to fraction form
    128,874/189,072 = 189,072/x
  3. Step 3: Cross multiply
    128,874x = 189,072 × 189,072
  4. Step 4: Simplify right side
    128,874x = 35,748,221,184
  5. Step 5: Solve for x
    x = 35,748,221,184/128,874
  6. Step 6: Final answer
    x = 277,388.93

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.