Home / 21,190.38-31,785.80-6,399.42

Finding the Fourth Proportional to 21,190.38, 31,785.80 and 6,399.42

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Solution

The fourth proportional to 21,190.38, 31,785.80 and 6,399.42 is: 9,599.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,190.38 : 31,785.80 = 6,399.42 : x
  2. Step 2: Convert to fraction form
    21,190.38/31,785.80 = 6,399.42/x
  3. Step 3: Cross multiply
    21,190.38x = 31,785.80 × 6,399.42
  4. Step 4: Simplify right side
    21,190.38x = 203,410,684.24
  5. Step 5: Solve for x
    x = 203,410,684.24/21,190.38
  6. Step 6: Final answer
    x = 9,599.20

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1.5x scale

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.