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Finding the Third Proportional to 61,122 and 128,880

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Solution

The third proportional to 61,122 and 128,880 is: 271,752.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,122 : 128,880 = 128,880 : x
  2. Step 2: Convert to fraction form
    61,122/128,880 = 128,880/x
  3. Step 3: Cross multiply
    61,122x = 128,880 × 128,880
  4. Step 4: Simplify right side
    61,122x = 16,610,054,400
  5. Step 5: Solve for x
    x = 16,610,054,400/61,122
  6. Step 6: Final answer
    x = 271,752.47

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.