Home / 20,931.26-31,396.46-6,139.85

Finding the Fourth Proportional to 20,931.26, 31,396.46 and 6,139.85

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Solution

The fourth proportional to 20,931.26, 31,396.46 and 6,139.85 is: 9,209.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.26 : 31,396.46 = 6,139.85 : x
  2. Step 2: Convert to fraction form
    20,931.26/31,396.46 = 6,139.85/x
  3. Step 3: Cross multiply
    20,931.26x = 31,396.46 × 6,139.85
  4. Step 4: Simplify right side
    20,931.26x = 192,769,367.25
  5. Step 5: Solve for x
    x = 192,769,367.25/20,931.26
  6. Step 6: Final answer
    x = 9,209.64

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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.