Home / 20,515.60-30,791.40-12,185.20

Finding the Fourth Proportional to 20,515.60, 30,791.40 and 12,185.20

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Solution

The fourth proportional to 20,515.60, 30,791.40 and 12,185.20 is: 18,288.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,515.60 : 30,791.40 = 12,185.20 : x
  2. Step 2: Convert to fraction form
    20,515.60/30,791.40 = 12,185.20/x
  3. Step 3: Cross multiply
    20,515.60x = 30,791.40 × 12,185.20
  4. Step 4: Simplify right side
    20,515.60x = 375,199,367.28
  5. Step 5: Solve for x
    x = 375,199,367.28/20,515.60
  6. Step 6: Final answer
    x = 18,288.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.