Home / 20,921.90-31,383.11-6,131.12

Finding the Fourth Proportional to 20,921.90, 31,383.11 and 6,131.12

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Solution

The fourth proportional to 20,921.90, 31,383.11 and 6,131.12 is: 9,196.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.90 : 31,383.11 = 6,131.12 : x
  2. Step 2: Convert to fraction form
    20,921.90/31,383.11 = 6,131.12/x
  3. Step 3: Cross multiply
    20,921.90x = 31,383.11 × 6,131.12
  4. Step 4: Simplify right side
    20,921.90x = 192,413,425.81
  5. Step 5: Solve for x
    x = 192,413,425.81/20,921.90
  6. Step 6: Final answer
    x = 9,196.75

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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.