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Finding the Fourth Proportional to 87,991.32, 121,407 and 49,751.64

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Solution

The fourth proportional to 87,991.32, 121,407 and 49,751.64 is: 68,645.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,991.32 : 121,407 = 49,751.64 : x
  2. Step 2: Convert to fraction form
    87,991.32/121,407 = 49,751.64/x
  3. Step 3: Cross multiply
    87,991.32x = 121,407 × 49,751.64
  4. Step 4: Simplify right side
    87,991.32x = 6,040,197,357.48
  5. Step 5: Solve for x
    x = 6,040,197,357.48/87,991.32
  6. Step 6: Final answer
    x = 68,645.38

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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.