Home / 20,331.42-28,074.68-12,790.37

Finding the Fourth Proportional to 20,331.42, 28,074.68 and 12,790.37

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Solution

The fourth proportional to 20,331.42, 28,074.68 and 12,790.37 is: 17,661.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,331.42 : 28,074.68 = 12,790.37 : x
  2. Step 2: Convert to fraction form
    20,331.42/28,074.68 = 12,790.37/x
  3. Step 3: Cross multiply
    20,331.42x = 28,074.68 × 12,790.37
  4. Step 4: Simplify right side
    20,331.42x = 359,085,599.03
  5. Step 5: Solve for x
    x = 359,085,599.03/20,331.42
  6. Step 6: Final answer
    x = 17,661.61

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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.