Home / 20,757.21-28,640.67-13,200.81

Finding the Fourth Proportional to 20,757.21, 28,640.67 and 13,200.81

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Solution

The fourth proportional to 20,757.21, 28,640.67 and 13,200.81 is: 18,214.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,757.21 : 28,640.67 = 13,200.81 : x
  2. Step 2: Convert to fraction form
    20,757.21/28,640.67 = 13,200.81/x
  3. Step 3: Cross multiply
    20,757.21x = 28,640.67 × 13,200.81
  4. Step 4: Simplify right side
    20,757.21x = 378,080,042.94
  5. Step 5: Solve for x
    x = 378,080,042.94/20,757.21
  6. Step 6: Final answer
    x = 18,214.40

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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.