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Finding the Third Proportional to 129,870 and 281,880

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Solution

The third proportional to 129,870 and 281,880 is: 611,814.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,870 : 281,880 = 281,880 : x
  2. Step 2: Convert to fraction form
    129,870/281,880 = 281,880/x
  3. Step 3: Cross multiply
    129,870x = 281,880 × 281,880
  4. Step 4: Simplify right side
    129,870x = 79,456,334,400
  5. Step 5: Solve for x
    x = 79,456,334,400/129,870
  6. Step 6: Final answer
    x = 611,814.39

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.