Home / 87,989.63-120,976.05-78,337.67

Finding the Fourth Proportional to 87,989.63, 120,976.05 and 78,337.67

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Solution

The fourth proportional to 87,989.63, 120,976.05 and 78,337.67 is: 107,705.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,989.63 : 120,976.05 = 78,337.67 : x
  2. Step 2: Convert to fraction form
    87,989.63/120,976.05 = 78,337.67/x
  3. Step 3: Cross multiply
    87,989.63x = 120,976.05 × 78,337.67
  4. Step 4: Simplify right side
    87,989.63x = 9,476,981,277.92
  5. Step 5: Solve for x
    x = 9,476,981,277.92/87,989.63
  6. Step 6: Final answer
    x = 107,705.67

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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.