Home / 21,121.83-31,691.25-7,977.96

Finding the Fourth Proportional to 21,121.83, 31,691.25 and 7,977.96

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Solution

The fourth proportional to 21,121.83, 31,691.25 and 7,977.96 is: 11,970.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.83 : 31,691.25 = 7,977.96 : x
  2. Step 2: Convert to fraction form
    21,121.83/31,691.25 = 7,977.96/x
  3. Step 3: Cross multiply
    21,121.83x = 31,691.25 × 7,977.96
  4. Step 4: Simplify right side
    21,121.83x = 252,831,524.85
  5. Step 5: Solve for x
    x = 252,831,524.85/21,121.83
  6. Step 6: Final answer
    x = 11,970.15

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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.