Home / 20,766.15-31,112.10-12,636.90

Finding the Fourth Proportional to 20,766.15, 31,112.10 and 12,636.90

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Solution

The fourth proportional to 20,766.15, 31,112.10 and 12,636.90 is: 18,932.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,766.15 : 31,112.10 = 12,636.90 : x
  2. Step 2: Convert to fraction form
    20,766.15/31,112.10 = 12,636.90/x
  3. Step 3: Cross multiply
    20,766.15x = 31,112.10 × 12,636.90
  4. Step 4: Simplify right side
    20,766.15x = 393,160,496.49
  5. Step 5: Solve for x
    x = 393,160,496.49/20,766.15
  6. Step 6: Final answer
    x = 18,932.76

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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.