Home / 20,905.21-28,849.26-11,345.09

Finding the Fourth Proportional to 20,905.21, 28,849.26 and 11,345.09

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Solution

The fourth proportional to 20,905.21, 28,849.26 and 11,345.09 is: 15,656.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.21 : 28,849.26 = 11,345.09 : x
  2. Step 2: Convert to fraction form
    20,905.21/28,849.26 = 11,345.09/x
  3. Step 3: Cross multiply
    20,905.21x = 28,849.26 × 11,345.09
  4. Step 4: Simplify right side
    20,905.21x = 327,297,479.80
  5. Step 5: Solve for x
    x = 327,297,479.80/20,905.21
  6. Step 6: Final answer
    x = 15,656.27

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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.