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Finding the Fourth Proportional to 87,991.88, 120,979.14 and 78,339.92

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Solution

The fourth proportional to 87,991.88, 120,979.14 and 78,339.92 is: 107,708.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,991.88 : 120,979.14 = 78,339.92 : x
  2. Step 2: Convert to fraction form
    87,991.88/120,979.14 = 78,339.92/x
  3. Step 3: Cross multiply
    87,991.88x = 120,979.14 × 78,339.92
  4. Step 4: Simplify right side
    87,991.88x = 9,477,495,544.37
  5. Step 5: Solve for x
    x = 9,477,495,544.37/87,991.88
  6. Step 6: Final answer
    x = 107,708.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.