Home / 20,739.92-28,620.14-12,782.88

Finding the Fourth Proportional to 20,739.92, 28,620.14 and 12,782.88

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Solution

The fourth proportional to 20,739.92, 28,620.14 and 12,782.88 is: 17,639.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,739.92 : 28,620.14 = 12,782.88 : x
  2. Step 2: Convert to fraction form
    20,739.92/28,620.14 = 12,782.88/x
  3. Step 3: Cross multiply
    20,739.92x = 28,620.14 × 12,782.88
  4. Step 4: Simplify right side
    20,739.92x = 365,847,751.29
  5. Step 5: Solve for x
    x = 365,847,751.29/20,739.92
  6. Step 6: Final answer
    x = 17,639.79

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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.