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Finding the Fourth Proportional to 20,479.74, 30,680.24 and 12,559.16

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Solution

The fourth proportional to 20,479.74, 30,680.24 and 12,559.16 is: 18,814.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,479.74 : 30,680.24 = 12,559.16 : x
  2. Step 2: Convert to fraction form
    20,479.74/30,680.24 = 12,559.16/x
  3. Step 3: Cross multiply
    20,479.74x = 30,680.24 × 12,559.16
  4. Step 4: Simplify right side
    20,479.74x = 385,317,944.54
  5. Step 5: Solve for x
    x = 385,317,944.54/20,479.74
  6. Step 6: Final answer
    x = 18,814.60

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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.