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Finding the Third Proportional to 68,200 and 139,779

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Solution

The third proportional to 68,200 and 139,779 is: 286,483.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,200 : 139,779 = 139,779 : x
  2. Step 2: Convert to fraction form
    68,200/139,779 = 139,779/x
  3. Step 3: Cross multiply
    68,200x = 139,779 × 139,779
  4. Step 4: Simplify right side
    68,200x = 19,538,168,841
  5. Step 5: Solve for x
    x = 19,538,168,841/68,200
  6. Step 6: Final answer
    x = 286,483.41

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.