Home / 21,320.15-31,961.97-8,181.95

Finding the Fourth Proportional to 21,320.15, 31,961.97 and 8,181.95

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Solution

The fourth proportional to 21,320.15, 31,961.97 and 8,181.95 is: 12,265.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,320.15 : 31,961.97 = 8,181.95 : x
  2. Step 2: Convert to fraction form
    21,320.15/31,961.97 = 8,181.95/x
  3. Step 3: Cross multiply
    21,320.15x = 31,961.97 × 8,181.95
  4. Step 4: Simplify right side
    21,320.15x = 261,511,080.63
  5. Step 5: Solve for x
    x = 261,511,080.63/21,320.15
  6. Step 6: Final answer
    x = 12,265.91

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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.