Home / 20,863.31-28,791.38-12,479.81

Finding the Fourth Proportional to 20,863.31, 28,791.38 and 12,479.81

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Solution

The fourth proportional to 20,863.31, 28,791.38 and 12,479.81 is: 17,222.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,863.31 : 28,791.38 = 12,479.81 : x
  2. Step 2: Convert to fraction form
    20,863.31/28,791.38 = 12,479.81/x
  3. Step 3: Cross multiply
    20,863.31x = 28,791.38 × 12,479.81
  4. Step 4: Simplify right side
    20,863.31x = 359,310,961.62
  5. Step 5: Solve for x
    x = 359,310,961.62/20,863.31
  6. Step 6: Final answer
    x = 17,222.14

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1.5x scale

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.