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Finding the Fourth Proportional to 20,231.64, 30,347.10 and 7,919.64

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Solution

The fourth proportional to 20,231.64, 30,347.10 and 7,919.64 is: 11,879.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,231.64 : 30,347.10 = 7,919.64 : x
  2. Step 2: Convert to fraction form
    20,231.64/30,347.10 = 7,919.64/x
  3. Step 3: Cross multiply
    20,231.64x = 30,347.10 × 7,919.64
  4. Step 4: Simplify right side
    20,231.64x = 240,338,107.04
  5. Step 5: Solve for x
    x = 240,338,107.04/20,231.64
  6. Step 6: Final answer
    x = 11,879.32

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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.