Home / 20,806.16-28,715.64-13,255.76

Finding the Fourth Proportional to 20,806.16, 28,715.64 and 13,255.76

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Solution

The fourth proportional to 20,806.16, 28,715.64 and 13,255.76 is: 18,294.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,806.16 : 28,715.64 = 13,255.76 : x
  2. Step 2: Convert to fraction form
    20,806.16/28,715.64 = 13,255.76/x
  3. Step 3: Cross multiply
    20,806.16x = 28,715.64 × 13,255.76
  4. Step 4: Simplify right side
    20,806.16x = 380,647,632.09
  5. Step 5: Solve for x
    x = 380,647,632.09/20,806.16
  6. Step 6: Final answer
    x = 18,294.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.