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Finding the Third Proportional to 68,640 and 103,688

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Solution

The third proportional to 68,640 and 103,688 is: 156,631.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,640 : 103,688 = 103,688 : x
  2. Step 2: Convert to fraction form
    68,640/103,688 = 103,688/x
  3. Step 3: Cross multiply
    68,640x = 103,688 × 103,688
  4. Step 4: Simplify right side
    68,640x = 10,751,201,344
  5. Step 5: Solve for x
    x = 10,751,201,344/68,640
  6. Step 6: Final answer
    x = 156,631.72

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.