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Finding the Fourth Proportional to 20,959.71, 31,439.41 and 8,479.56

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Solution

The fourth proportional to 20,959.71, 31,439.41 and 8,479.56 is: 12,719.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,959.71 : 31,439.41 = 8,479.56 : x
  2. Step 2: Convert to fraction form
    20,959.71/31,439.41 = 8,479.56/x
  3. Step 3: Cross multiply
    20,959.71x = 31,439.41 × 8,479.56
  4. Step 4: Simplify right side
    20,959.71x = 266,592,363.46
  5. Step 5: Solve for x
    x = 266,592,363.46/20,959.71
  6. Step 6: Final answer
    x = 12,719.28

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Similar ratio
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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.