Home / 20,682.72-28,542.78-12,729.60

Finding the Fourth Proportional to 20,682.72, 28,542.78 and 12,729.60

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Solution

The fourth proportional to 20,682.72, 28,542.78 and 12,729.60 is: 17,567.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,682.72 : 28,542.78 = 12,729.60 : x
  2. Step 2: Convert to fraction form
    20,682.72/28,542.78 = 12,729.60/x
  3. Step 3: Cross multiply
    20,682.72x = 28,542.78 × 12,729.60
  4. Step 4: Simplify right side
    20,682.72x = 363,338,172.29
  5. Step 5: Solve for x
    x = 363,338,172.29/20,682.72
  6. Step 6: Final answer
    x = 17,567.23

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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.