Home / 18,909.91-28,365.81-13,387.96

Finding the Fourth Proportional to 18,909.91, 28,365.81 and 13,387.96

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Solution

The fourth proportional to 18,909.91, 28,365.81 and 13,387.96 is: 20,082.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,909.91 : 28,365.81 = 13,387.96 : x
  2. Step 2: Convert to fraction form
    18,909.91/28,365.81 = 13,387.96/x
  3. Step 3: Cross multiply
    18,909.91x = 28,365.81 × 13,387.96
  4. Step 4: Simplify right side
    18,909.91x = 379,760,329.65
  5. Step 5: Solve for x
    x = 379,760,329.65/18,909.91
  6. Step 6: Final answer
    x = 20,082.61

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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.