Home / 20,928.20-28,880.90-11,496.75

Finding the Fourth Proportional to 20,928.20, 28,880.90 and 11,496.75

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Solution

The fourth proportional to 20,928.20, 28,880.90 and 11,496.75 is: 15,865.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,928.20 : 28,880.90 = 11,496.75 : x
  2. Step 2: Convert to fraction form
    20,928.20/28,880.90 = 11,496.75/x
  3. Step 3: Cross multiply
    20,928.20x = 28,880.90 × 11,496.75
  4. Step 4: Simplify right side
    20,928.20x = 332,036,429.59
  5. Step 5: Solve for x
    x = 332,036,429.59/20,928.20
  6. Step 6: Final answer
    x = 15,865.51

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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.