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Finding the Fourth Proportional to 100,552.97, 138,665.44 and 67,919.15

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Solution

The fourth proportional to 100,552.97, 138,665.44 and 67,919.15 is: 93,662.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,552.97 : 138,665.44 = 67,919.15 : x
  2. Step 2: Convert to fraction form
    100,552.97/138,665.44 = 67,919.15/x
  3. Step 3: Cross multiply
    100,552.97x = 138,665.44 × 67,919.15
  4. Step 4: Simplify right side
    100,552.97x = 9,418,038,819.18
  5. Step 5: Solve for x
    x = 9,418,038,819.18/100,552.97
  6. Step 6: Final answer
    x = 93,662.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.