Home / 20,939.28-28,895.62-11,507.84

Finding the Fourth Proportional to 20,939.28, 28,895.62 and 11,507.84

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Solution

The fourth proportional to 20,939.28, 28,895.62 and 11,507.84 is: 15,880.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.28 : 28,895.62 = 11,507.84 : x
  2. Step 2: Convert to fraction form
    20,939.28/28,895.62 = 11,507.84/x
  3. Step 3: Cross multiply
    20,939.28x = 28,895.62 × 11,507.84
  4. Step 4: Simplify right side
    20,939.28x = 332,526,171.66
  5. Step 5: Solve for x
    x = 332,526,171.66/20,939.28
  6. Step 6: Final answer
    x = 15,880.50

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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.