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Finding the Fourth Proportional to 20,479.79, 30,723.29 and 8,471.90

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Solution

The fourth proportional to 20,479.79, 30,723.29 and 8,471.90 is: 12,709.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,479.79 : 30,723.29 = 8,471.90 : x
  2. Step 2: Convert to fraction form
    20,479.79/30,723.29 = 8,471.90/x
  3. Step 3: Cross multiply
    20,479.79x = 30,723.29 × 8,471.90
  4. Step 4: Simplify right side
    20,479.79x = 260,284,706.77
  5. Step 5: Solve for x
    x = 260,284,706.77/20,479.79
  6. Step 6: Final answer
    x = 12,709.34

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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.