Home / 20,821.25-31,235.15-8,978.39

Finding the Fourth Proportional to 20,821.25, 31,235.15 and 8,978.39

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Solution

The fourth proportional to 20,821.25, 31,235.15 and 8,978.39 is: 13,469.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.25 : 31,235.15 = 8,978.39 : x
  2. Step 2: Convert to fraction form
    20,821.25/31,235.15 = 8,978.39/x
  3. Step 3: Cross multiply
    20,821.25x = 31,235.15 × 8,978.39
  4. Step 4: Simplify right side
    20,821.25x = 280,441,358.41
  5. Step 5: Solve for x
    x = 280,441,358.41/20,821.25
  6. Step 6: Final answer
    x = 13,469.00

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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.