Home / 20,661.45-30,991.60-13,891.55

Finding the Fourth Proportional to 20,661.45, 30,991.60 and 13,891.55

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Solution

The fourth proportional to 20,661.45, 30,991.60 and 13,891.55 is: 20,836.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661.45 : 30,991.60 = 13,891.55 : x
  2. Step 2: Convert to fraction form
    20,661.45/30,991.60 = 13,891.55/x
  3. Step 3: Cross multiply
    20,661.45x = 30,991.60 × 13,891.55
  4. Step 4: Simplify right side
    20,661.45x = 430,521,136.56
  5. Step 5: Solve for x
    x = 430,521,136.56/20,661.45
  6. Step 6: Final answer
    x = 20,836.93

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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.