Home / 18,910.21-28,286.31-13,287.49

Finding the Fourth Proportional to 18,910.21, 28,286.31 and 13,287.49

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Solution

The fourth proportional to 18,910.21, 28,286.31 and 13,287.49 is: 19,875.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,910.21 : 28,286.31 = 13,287.49 : x
  2. Step 2: Convert to fraction form
    18,910.21/28,286.31 = 13,287.49/x
  3. Step 3: Cross multiply
    18,910.21x = 28,286.31 × 13,287.49
  4. Step 4: Simplify right side
    18,910.21x = 375,853,978.44
  5. Step 5: Solve for x
    x = 375,853,978.44/18,910.21
  6. Step 6: Final answer
    x = 19,875.71

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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.