Home / 20,909.33-31,340.13-8,421.36

Finding the Fourth Proportional to 20,909.33, 31,340.13 and 8,421.36

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Solution

The fourth proportional to 20,909.33, 31,340.13 and 8,421.36 is: 12,622.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,909.33 : 31,340.13 = 8,421.36 : x
  2. Step 2: Convert to fraction form
    20,909.33/31,340.13 = 8,421.36/x
  3. Step 3: Cross multiply
    20,909.33x = 31,340.13 × 8,421.36
  4. Step 4: Simplify right side
    20,909.33x = 263,926,517.18
  5. Step 5: Solve for x
    x = 263,926,517.18/20,909.33
  6. Step 6: Final answer
    x = 12,622.43

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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.