Home / 21,289.55-31,933.24-8,140.91

Finding the Fourth Proportional to 21,289.55, 31,933.24 and 8,140.91

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Solution

The fourth proportional to 21,289.55, 31,933.24 and 8,140.91 is: 12,210.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,289.55 : 31,933.24 = 8,140.91 : x
  2. Step 2: Convert to fraction form
    21,289.55/31,933.24 = 8,140.91/x
  3. Step 3: Cross multiply
    21,289.55x = 31,933.24 × 8,140.91
  4. Step 4: Simplify right side
    21,289.55x = 259,965,632.85
  5. Step 5: Solve for x
    x = 259,965,632.85/21,289.55
  6. Step 6: Final answer
    x = 12,210.95

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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.