Home / 20,991.12-31,418.64-15,443.28

Finding the Fourth Proportional to 20,991.12, 31,418.64 and 15,443.28

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Solution

The fourth proportional to 20,991.12, 31,418.64 and 15,443.28 is: 23,114.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.12 : 31,418.64 = 15,443.28 : x
  2. Step 2: Convert to fraction form
    20,991.12/31,418.64 = 15,443.28/x
  3. Step 3: Cross multiply
    20,991.12x = 31,418.64 × 15,443.28
  4. Step 4: Simplify right side
    20,991.12x = 485,206,854.74
  5. Step 5: Solve for x
    x = 485,206,854.74/20,991.12
  6. Step 6: Final answer
    x = 23,114.86

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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.