Home / 21,972.20-30,321.70-11,900.66

Finding the Fourth Proportional to 21,972.20, 30,321.70 and 11,900.66

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Solution

The fourth proportional to 21,972.20, 30,321.70 and 11,900.66 is: 16,422.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,972.20 : 30,321.70 = 11,900.66 : x
  2. Step 2: Convert to fraction form
    21,972.20/30,321.70 = 11,900.66/x
  3. Step 3: Cross multiply
    21,972.20x = 30,321.70 × 11,900.66
  4. Step 4: Simplify right side
    21,972.20x = 360,848,288.37
  5. Step 5: Solve for x
    x = 360,848,288.37/21,972.20
  6. Step 6: Final answer
    x = 16,422.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.