Home / 13,821.13-18,920.56-13,722.31

Finding the Fourth Proportional to 13,821.13, 18,920.56 and 13,722.31

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Solution

The fourth proportional to 13,821.13, 18,920.56 and 13,722.31 is: 18,785.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,821.13 : 18,920.56 = 13,722.31 : x
  2. Step 2: Convert to fraction form
    13,821.13/18,920.56 = 13,722.31/x
  3. Step 3: Cross multiply
    13,821.13x = 18,920.56 × 13,722.31
  4. Step 4: Simplify right side
    13,821.13x = 259,633,789.69
  5. Step 5: Solve for x
    x = 259,633,789.69/13,821.13
  6. Step 6: Final answer
    x = 18,785.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.