Home / 20,707.80-28,576.04-13,629.21

Finding the Fourth Proportional to 20,707.80, 28,576.04 and 13,629.21

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Solution

The fourth proportional to 20,707.80, 28,576.04 and 13,629.21 is: 18,807.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,707.80 : 28,576.04 = 13,629.21 : x
  2. Step 2: Convert to fraction form
    20,707.80/28,576.04 = 13,629.21/x
  3. Step 3: Cross multiply
    20,707.80x = 28,576.04 × 13,629.21
  4. Step 4: Simplify right side
    20,707.80x = 389,468,781.98
  5. Step 5: Solve for x
    x = 389,468,781.98/20,707.80
  6. Step 6: Final answer
    x = 18,807.83

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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.