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Finding the Third Proportional to 129,172 and 278,728

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Solution

The third proportional to 129,172 and 278,728 is: 601,440.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,172 : 278,728 = 278,728 : x
  2. Step 2: Convert to fraction form
    129,172/278,728 = 278,728/x
  3. Step 3: Cross multiply
    129,172x = 278,728 × 278,728
  4. Step 4: Simplify right side
    129,172x = 77,689,297,984
  5. Step 5: Solve for x
    x = 77,689,297,984/129,172
  6. Step 6: Final answer
    x = 601,440.70

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.