Home / 80,781.62-121,172.49-38,651.76

Finding the Fourth Proportional to 80,781.62, 121,172.49 and 38,651.76

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Solution

The fourth proportional to 80,781.62, 121,172.49 and 38,651.76 is: 57,977.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,781.62 : 121,172.49 = 38,651.76 : x
  2. Step 2: Convert to fraction form
    80,781.62/121,172.49 = 38,651.76/x
  3. Step 3: Cross multiply
    80,781.62x = 121,172.49 × 38,651.76
  4. Step 4: Simplify right side
    80,781.62x = 4,683,530,002.08
  5. Step 5: Solve for x
    x = 4,683,530,002.08/80,781.62
  6. Step 6: Final answer
    x = 57,977.67

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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.