Home / 20,961.72-31,434.12-8,479.44

Finding the Fourth Proportional to 20,961.72, 31,434.12 and 8,479.44

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Solution

The fourth proportional to 20,961.72, 31,434.12 and 8,479.44 is: 12,715.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,961.72 : 31,434.12 = 8,479.44 : x
  2. Step 2: Convert to fraction form
    20,961.72/31,434.12 = 8,479.44/x
  3. Step 3: Cross multiply
    20,961.72x = 31,434.12 × 8,479.44
  4. Step 4: Simplify right side
    20,961.72x = 266,543,734.49
  5. Step 5: Solve for x
    x = 266,543,734.49/20,961.72
  6. Step 6: Final answer
    x = 12,715.74

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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.