Home / 21,286.12-31,930.62-8,139.88

Finding the Fourth Proportional to 21,286.12, 31,930.62 and 8,139.88

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Solution

The fourth proportional to 21,286.12, 31,930.62 and 8,139.88 is: 12,210.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,286.12 : 31,930.62 = 8,139.88 : x
  2. Step 2: Convert to fraction form
    21,286.12/31,930.62 = 8,139.88/x
  3. Step 3: Cross multiply
    21,286.12x = 31,930.62 × 8,139.88
  4. Step 4: Simplify right side
    21,286.12x = 259,911,415.13
  5. Step 5: Solve for x
    x = 259,911,415.13/21,286.12
  6. Step 6: Final answer
    x = 12,210.37

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1.5x scale

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.