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Finding the Fourth Proportional to 20,479.34, 30,722.63 and 8,471.46

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Solution

The fourth proportional to 20,479.34, 30,722.63 and 8,471.46 is: 12,708.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,479.34 : 30,722.63 = 8,471.46 : x
  2. Step 2: Convert to fraction form
    20,479.34/30,722.63 = 8,471.46/x
  3. Step 3: Cross multiply
    20,479.34x = 30,722.63 × 8,471.46
  4. Step 4: Simplify right side
    20,479.34x = 260,265,603.99
  5. Step 5: Solve for x
    x = 260,265,603.99/20,479.34
  6. Step 6: Final answer
    x = 12,708.69

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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.