Home / 20,960.76-31,450.24-7,811.42

Finding the Fourth Proportional to 20,960.76, 31,450.24 and 7,811.42

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Solution

The fourth proportional to 20,960.76, 31,450.24 and 7,811.42 is: 11,720.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,960.76 : 31,450.24 = 7,811.42 : x
  2. Step 2: Convert to fraction form
    20,960.76/31,450.24 = 7,811.42/x
  3. Step 3: Cross multiply
    20,960.76x = 31,450.24 × 7,811.42
  4. Step 4: Simplify right side
    20,960.76x = 245,671,033.74
  5. Step 5: Solve for x
    x = 245,671,033.74/20,960.76
  6. Step 6: Final answer
    x = 11,720.52

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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.