Home / 21,555.20-29,742.24-12,120.32

Finding the Fourth Proportional to 21,555.20, 29,742.24 and 12,120.32

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Solution

The fourth proportional to 21,555.20, 29,742.24 and 12,120.32 is: 16,723.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,555.20 : 29,742.24 = 12,120.32 : x
  2. Step 2: Convert to fraction form
    21,555.20/29,742.24 = 12,120.32/x
  3. Step 3: Cross multiply
    21,555.20x = 29,742.24 × 12,120.32
  4. Step 4: Simplify right side
    21,555.20x = 360,485,466.32
  5. Step 5: Solve for x
    x = 360,485,466.32/21,555.20
  6. Step 6: Final answer
    x = 16,723.83

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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.