Home / 21,180.45-31,720.57-18,391.96

Finding the Fourth Proportional to 21,180.45, 31,720.57 and 18,391.96

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Solution

The fourth proportional to 21,180.45, 31,720.57 and 18,391.96 is: 27,544.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,180.45 : 31,720.57 = 18,391.96 : x
  2. Step 2: Convert to fraction form
    21,180.45/31,720.57 = 18,391.96/x
  3. Step 3: Cross multiply
    21,180.45x = 31,720.57 × 18,391.96
  4. Step 4: Simplify right side
    21,180.45x = 583,403,454.62
  5. Step 5: Solve for x
    x = 583,403,454.62/21,180.45
  6. Step 6: Final answer
    x = 27,544.44

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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.