Home / 13,321.20-19,972.20-7,479.60

Finding the Fourth Proportional to 13,321.20, 19,972.20 and 7,479.60

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Solution

The fourth proportional to 13,321.20, 19,972.20 and 7,479.60 is: 11,214.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,321.20 : 19,972.20 = 7,479.60 : x
  2. Step 2: Convert to fraction form
    13,321.20/19,972.20 = 7,479.60/x
  3. Step 3: Cross multiply
    13,321.20x = 19,972.20 × 7,479.60
  4. Step 4: Simplify right side
    13,321.20x = 149,384,067.12
  5. Step 5: Solve for x
    x = 149,384,067.12/13,321.20
  6. Step 6: Final answer
    x = 11,214.01

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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.