Home / 20,984.50-31,486.47-11,128.42

Finding the Fourth Proportional to 20,984.50, 31,486.47 and 11,128.42

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Solution

The fourth proportional to 20,984.50, 31,486.47 and 11,128.42 is: 16,697.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,984.50 : 31,486.47 = 11,128.42 : x
  2. Step 2: Convert to fraction form
    20,984.50/31,486.47 = 11,128.42/x
  3. Step 3: Cross multiply
    20,984.50x = 31,486.47 × 11,128.42
  4. Step 4: Simplify right side
    20,984.50x = 350,394,662.48
  5. Step 5: Solve for x
    x = 350,394,662.48/20,984.50
  6. Step 6: Final answer
    x = 16,697.78

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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.