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Finding the Fourth Proportional to 20,479.97, 30,680.55 and 12,559.37

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Solution

The fourth proportional to 20,479.97, 30,680.55 and 12,559.37 is: 18,814.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,479.97 : 30,680.55 = 12,559.37 : x
  2. Step 2: Convert to fraction form
    20,479.97/30,680.55 = 12,559.37/x
  3. Step 3: Cross multiply
    20,479.97x = 30,680.55 × 12,559.37
  4. Step 4: Simplify right side
    20,479.97x = 385,328,225.85
  5. Step 5: Solve for x
    x = 385,328,225.85/20,479.97
  6. Step 6: Final answer
    x = 18,814.88

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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.