Home / 21,321.29-31,959.60-11,947.57

Finding the Fourth Proportional to 21,321.29, 31,959.60 and 11,947.57

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Solution

The fourth proportional to 21,321.29, 31,959.60 and 11,947.57 is: 17,908.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,321.29 : 31,959.60 = 11,947.57 : x
  2. Step 2: Convert to fraction form
    21,321.29/31,959.60 = 11,947.57/x
  3. Step 3: Cross multiply
    21,321.29x = 31,959.60 × 11,947.57
  4. Step 4: Simplify right side
    21,321.29x = 381,839,433.47
  5. Step 5: Solve for x
    x = 381,839,433.47/21,321.29
  6. Step 6: Final answer
    x = 17,908.83

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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.