Home / 20,721.98-31,083-15,819.46

Finding the Fourth Proportional to 20,721.98, 31,083 and 15,819.46

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Solution

The fourth proportional to 20,721.98, 31,083 and 15,819.46 is: 23,729.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,721.98 : 31,083 = 15,819.46 : x
  2. Step 2: Convert to fraction form
    20,721.98/31,083 = 15,819.46/x
  3. Step 3: Cross multiply
    20,721.98x = 31,083 × 15,819.46
  4. Step 4: Simplify right side
    20,721.98x = 491,716,275.18
  5. Step 5: Solve for x
    x = 491,716,275.18/20,721.98
  6. Step 6: Final answer
    x = 23,729.21

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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.