Home / 87,990.37-120,977.08-78,338.41

Finding the Fourth Proportional to 87,990.37, 120,977.08 and 78,338.41

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Solution

The fourth proportional to 87,990.37, 120,977.08 and 78,338.41 is: 107,706.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,990.37 : 120,977.08 = 78,338.41 : x
  2. Step 2: Convert to fraction form
    87,990.37/120,977.08 = 78,338.41/x
  3. Step 3: Cross multiply
    87,990.37x = 120,977.08 × 78,338.41
  4. Step 4: Simplify right side
    87,990.37x = 9,477,151,595.35
  5. Step 5: Solve for x
    x = 9,477,151,595.35/87,990.37
  6. Step 6: Final answer
    x = 107,706.69

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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.