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Finding the Fourth Proportional to 100,401.96, 138,550.11 and 55,078.97

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Solution

The fourth proportional to 100,401.96, 138,550.11 and 55,078.97 is: 76,006.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,401.96 : 138,550.11 = 55,078.97 : x
  2. Step 2: Convert to fraction form
    100,401.96/138,550.11 = 55,078.97/x
  3. Step 3: Cross multiply
    100,401.96x = 138,550.11 × 55,078.97
  4. Step 4: Simplify right side
    100,401.96x = 7,631,196,659.44
  5. Step 5: Solve for x
    x = 7,631,196,659.44/100,401.96
  6. Step 6: Final answer
    x = 76,006.45

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1.5x scale

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.