Home / 20,991.13-31,488.51-5,408.75

Finding the Fourth Proportional to 20,991.13, 31,488.51 and 5,408.75

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Solution

The fourth proportional to 20,991.13, 31,488.51 and 5,408.75 is: 8,113.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.13 : 31,488.51 = 5,408.75 : x
  2. Step 2: Convert to fraction form
    20,991.13/31,488.51 = 5,408.75/x
  3. Step 3: Cross multiply
    20,991.13x = 31,488.51 × 5,408.75
  4. Step 4: Simplify right side
    20,991.13x = 170,313,478.46
  5. Step 5: Solve for x
    x = 170,313,478.46/20,991.13
  6. Step 6: Final answer
    x = 8,113.59

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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.