Home / 20,479.12-30,713.20-12,630.52

Finding the Fourth Proportional to 20,479.12, 30,713.20 and 12,630.52

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Solution

The fourth proportional to 20,479.12, 30,713.20 and 12,630.52 is: 18,942.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,479.12 : 30,713.20 = 12,630.52 : x
  2. Step 2: Convert to fraction form
    20,479.12/30,713.20 = 12,630.52/x
  3. Step 3: Cross multiply
    20,479.12x = 30,713.20 × 12,630.52
  4. Step 4: Simplify right side
    20,479.12x = 387,923,686.86
  5. Step 5: Solve for x
    x = 387,923,686.86/20,479.12
  6. Step 6: Final answer
    x = 18,942.40

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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.