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Finding the Fourth Proportional to 20,960.06, 31,443.96 and 6,921.06

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Solution

The fourth proportional to 20,960.06, 31,443.96 and 6,921.06 is: 10,382.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,960.06 : 31,443.96 = 6,921.06 : x
  2. Step 2: Convert to fraction form
    20,960.06/31,443.96 = 6,921.06/x
  3. Step 3: Cross multiply
    20,960.06x = 31,443.96 × 6,921.06
  4. Step 4: Simplify right side
    20,960.06x = 217,625,533.80
  5. Step 5: Solve for x
    x = 217,625,533.80/20,960.06
  6. Step 6: Final answer
    x = 10,382.87

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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.