Home / 20,986.36-31,479.62-7,838.60

Finding the Fourth Proportional to 20,986.36, 31,479.62 and 7,838.60

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Solution

The fourth proportional to 20,986.36, 31,479.62 and 7,838.60 is: 11,757.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.36 : 31,479.62 = 7,838.60 : x
  2. Step 2: Convert to fraction form
    20,986.36/31,479.62 = 7,838.60/x
  3. Step 3: Cross multiply
    20,986.36x = 31,479.62 × 7,838.60
  4. Step 4: Simplify right side
    20,986.36x = 246,756,149.33
  5. Step 5: Solve for x
    x = 246,756,149.33/20,986.36
  6. Step 6: Final answer
    x = 11,757.93

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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.