Home / 20,912.38-31,344.86-10,389.71

Finding the Fourth Proportional to 20,912.38, 31,344.86 and 10,389.71

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Solution

The fourth proportional to 20,912.38, 31,344.86 and 10,389.71 is: 15,572.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.38 : 31,344.86 = 10,389.71 : x
  2. Step 2: Convert to fraction form
    20,912.38/31,344.86 = 10,389.71/x
  3. Step 3: Cross multiply
    20,912.38x = 31,344.86 × 10,389.71
  4. Step 4: Simplify right side
    20,912.38x = 325,664,109.73
  5. Step 5: Solve for x
    x = 325,664,109.73/20,912.38
  6. Step 6: Final answer
    x = 15,572.79

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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.