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Finding the Third Proportional to 100,858.50 and 217,278

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Solution

The third proportional to 100,858.50 and 217,278 is: 468,078.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,858.50 : 217,278 = 217,278 : x
  2. Step 2: Convert to fraction form
    100,858.50/217,278 = 217,278/x
  3. Step 3: Cross multiply
    100,858.50x = 217,278 × 217,278
  4. Step 4: Simplify right side
    100,858.50x = 47,209,729,284
  5. Step 5: Solve for x
    x = 47,209,729,284/100,858.50
  6. Step 6: Final answer
    x = 468,078.84

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.