Home / 20,842.20-28,759.50-12,779.46

Finding the Fourth Proportional to 20,842.20, 28,759.50 and 12,779.46

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Solution

The fourth proportional to 20,842.20, 28,759.50 and 12,779.46 is: 17,633.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,842.20 : 28,759.50 = 12,779.46 : x
  2. Step 2: Convert to fraction form
    20,842.20/28,759.50 = 12,779.46/x
  3. Step 3: Cross multiply
    20,842.20x = 28,759.50 × 12,779.46
  4. Step 4: Simplify right side
    20,842.20x = 367,530,879.87
  5. Step 5: Solve for x
    x = 367,530,879.87/20,842.20
  6. Step 6: Final answer
    x = 17,633.98

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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.