Home / 20,438.46-28,205.33-12,479.58

Finding the Fourth Proportional to 20,438.46, 28,205.33 and 12,479.58

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Solution

The fourth proportional to 20,438.46, 28,205.33 and 12,479.58 is: 17,221.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,438.46 : 28,205.33 = 12,479.58 : x
  2. Step 2: Convert to fraction form
    20,438.46/28,205.33 = 12,479.58/x
  3. Step 3: Cross multiply
    20,438.46x = 28,205.33 × 12,479.58
  4. Step 4: Simplify right side
    20,438.46x = 351,990,609.76
  5. Step 5: Solve for x
    x = 351,990,609.76/20,438.46
  6. Step 6: Final answer
    x = 17,221.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.