Home / 21,120.26-31,691.40-15,324.68

Finding the Fourth Proportional to 21,120.26, 31,691.40 and 15,324.68

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Solution

The fourth proportional to 21,120.26, 31,691.40 and 15,324.68 is: 22,995.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.26 : 31,691.40 = 15,324.68 : x
  2. Step 2: Convert to fraction form
    21,120.26/31,691.40 = 15,324.68/x
  3. Step 3: Cross multiply
    21,120.26x = 31,691.40 × 15,324.68
  4. Step 4: Simplify right side
    21,120.26x = 485,660,563.75
  5. Step 5: Solve for x
    x = 485,660,563.75/21,120.26
  6. Step 6: Final answer
    x = 22,995.01

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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.