Home / 20,961.15-31,439.33-7,813.95

Finding the Fourth Proportional to 20,961.15, 31,439.33 and 7,813.95

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Solution

The fourth proportional to 20,961.15, 31,439.33 and 7,813.95 is: 11,720.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,961.15 : 31,439.33 = 7,813.95 : x
  2. Step 2: Convert to fraction form
    20,961.15/31,439.33 = 7,813.95/x
  3. Step 3: Cross multiply
    20,961.15x = 31,439.33 × 7,813.95
  4. Step 4: Simplify right side
    20,961.15x = 245,665,313.58
  5. Step 5: Solve for x
    x = 245,665,313.58/20,961.15
  6. Step 6: Final answer
    x = 11,720.03

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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.