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Finding the Third Proportional to 42,640 and 66,739

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Solution

The third proportional to 42,640 and 66,739 is: 104,458.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,640 : 66,739 = 66,739 : x
  2. Step 2: Convert to fraction form
    42,640/66,739 = 66,739/x
  3. Step 3: Cross multiply
    42,640x = 66,739 × 66,739
  4. Step 4: Simplify right side
    42,640x = 4,454,094,121
  5. Step 5: Solve for x
    x = 4,454,094,121/42,640
  6. Step 6: Final answer
    x = 104,458.12

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.