Home / 21,118.80-31,689.12-15,323.24

Finding the Fourth Proportional to 21,118.80, 31,689.12 and 15,323.24

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Solution

The fourth proportional to 21,118.80, 31,689.12 and 15,323.24 is: 22,992.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,118.80 : 31,689.12 = 15,323.24 : x
  2. Step 2: Convert to fraction form
    21,118.80/31,689.12 = 15,323.24/x
  3. Step 3: Cross multiply
    21,118.80x = 31,689.12 × 15,323.24
  4. Step 4: Simplify right side
    21,118.80x = 485,579,991.15
  5. Step 5: Solve for x
    x = 485,579,991.15/21,118.80
  6. Step 6: Final answer
    x = 22,992.78

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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.