Home / 87,890.40-131,749.20-78,559.20

Finding the Fourth Proportional to 87,890.40, 131,749.20 and 78,559.20

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Solution

The fourth proportional to 87,890.40, 131,749.20 and 78,559.20 is: 117,761.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,890.40 : 131,749.20 = 78,559.20 : x
  2. Step 2: Convert to fraction form
    87,890.40/131,749.20 = 78,559.20/x
  3. Step 3: Cross multiply
    87,890.40x = 131,749.20 × 78,559.20
  4. Step 4: Simplify right side
    87,890.40x = 10,350,111,752.64
  5. Step 5: Solve for x
    x = 10,350,111,752.64/87,890.40
  6. Step 6: Final answer
    x = 117,761.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.