Home / 20,391.96-28,140.84-11,318.69

Finding the Fourth Proportional to 20,391.96, 28,140.84 and 11,318.69

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Solution

The fourth proportional to 20,391.96, 28,140.84 and 11,318.69 is: 15,619.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.96 : 28,140.84 = 11,318.69 : x
  2. Step 2: Convert to fraction form
    20,391.96/28,140.84 = 11,318.69/x
  3. Step 3: Cross multiply
    20,391.96x = 28,140.84 × 11,318.69
  4. Step 4: Simplify right side
    20,391.96x = 318,517,514.65
  5. Step 5: Solve for x
    x = 318,517,514.65/20,391.96
  6. Step 6: Final answer
    x = 15,619.76

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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.