Home / 20,380.30-28,112.90-12,814.65

Finding the Fourth Proportional to 20,380.30, 28,112.90 and 12,814.65

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Solution

The fourth proportional to 20,380.30, 28,112.90 and 12,814.65 is: 17,676.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,380.30 : 28,112.90 = 12,814.65 : x
  2. Step 2: Convert to fraction form
    20,380.30/28,112.90 = 12,814.65/x
  3. Step 3: Cross multiply
    20,380.30x = 28,112.90 × 12,814.65
  4. Step 4: Simplify right side
    20,380.30x = 360,256,909.91
  5. Step 5: Solve for x
    x = 360,256,909.91/20,380.30
  6. Step 6: Final answer
    x = 17,676.72

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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.