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Finding the Third Proportional to 69,428 and 149,392

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Solution

The third proportional to 69,428 and 149,392 is: 321,454.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,428 : 149,392 = 149,392 : x
  2. Step 2: Convert to fraction form
    69,428/149,392 = 149,392/x
  3. Step 3: Cross multiply
    69,428x = 149,392 × 149,392
  4. Step 4: Simplify right side
    69,428x = 22,317,969,664
  5. Step 5: Solve for x
    x = 22,317,969,664/69,428
  6. Step 6: Final answer
    x = 321,454.88

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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.