Home / 20,340.81-28,067.10-11,388.69

Finding the Fourth Proportional to 20,340.81, 28,067.10 and 11,388.69

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Solution

The fourth proportional to 20,340.81, 28,067.10 and 11,388.69 is: 15,714.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,340.81 : 28,067.10 = 11,388.69 : x
  2. Step 2: Convert to fraction form
    20,340.81/28,067.10 = 11,388.69/x
  3. Step 3: Cross multiply
    20,340.81x = 28,067.10 × 11,388.69
  4. Step 4: Simplify right side
    20,340.81x = 319,647,501.10
  5. Step 5: Solve for x
    x = 319,647,501.10/20,340.81
  6. Step 6: Final answer
    x = 15,714.59

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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.