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Finding the Third Proportional to 66,388 and 143,339

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Solution

The third proportional to 66,388 and 143,339 is: 309,484.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,388 : 143,339 = 143,339 : x
  2. Step 2: Convert to fraction form
    66,388/143,339 = 143,339/x
  3. Step 3: Cross multiply
    66,388x = 143,339 × 143,339
  4. Step 4: Simplify right side
    66,388x = 20,546,068,921
  5. Step 5: Solve for x
    x = 20,546,068,921/66,388
  6. Step 6: Final answer
    x = 309,484.68

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.