Home / 20,372.60-28,116.18-11,420.12

Finding the Fourth Proportional to 20,372.60, 28,116.18 and 11,420.12

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Solution

The fourth proportional to 20,372.60, 28,116.18 and 11,420.12 is: 15,760.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,372.60 : 28,116.18 = 11,420.12 : x
  2. Step 2: Convert to fraction form
    20,372.60/28,116.18 = 11,420.12/x
  3. Step 3: Cross multiply
    20,372.60x = 28,116.18 × 11,420.12
  4. Step 4: Simplify right side
    20,372.60x = 321,090,149.54
  5. Step 5: Solve for x
    x = 321,090,149.54/20,372.60
  6. Step 6: Final answer
    x = 15,760.88

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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.