Home / 21,282.12-31,911.84-8,126.91

Finding the Fourth Proportional to 21,282.12, 31,911.84 and 8,126.91

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Solution

The fourth proportional to 21,282.12, 31,911.84 and 8,126.91 is: 12,186.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,282.12 : 31,911.84 = 8,126.91 : x
  2. Step 2: Convert to fraction form
    21,282.12/31,911.84 = 8,126.91/x
  3. Step 3: Cross multiply
    21,282.12x = 31,911.84 × 8,126.91
  4. Step 4: Simplify right side
    21,282.12x = 259,344,651.61
  5. Step 5: Solve for x
    x = 259,344,651.61/21,282.12
  6. Step 6: Final answer
    x = 12,186.03

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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.