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Finding the Fourth Proportional to 20,959.37, 31,439.09 and 6,920.18

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Solution

The fourth proportional to 20,959.37, 31,439.09 and 6,920.18 is: 10,380.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,959.37 : 31,439.09 = 6,920.18 : x
  2. Step 2: Convert to fraction form
    20,959.37/31,439.09 = 6,920.18/x
  3. Step 3: Cross multiply
    20,959.37x = 31,439.09 × 6,920.18
  4. Step 4: Simplify right side
    20,959.37x = 217,564,161.84
  5. Step 5: Solve for x
    x = 217,564,161.84/20,959.37
  6. Step 6: Final answer
    x = 10,380.28

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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.