Home / 20,768.12-31,150.67-8,115.50

Finding the Fourth Proportional to 20,768.12, 31,150.67 and 8,115.50

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Solution

The fourth proportional to 20,768.12, 31,150.67 and 8,115.50 is: 12,172.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,768.12 : 31,150.67 = 8,115.50 : x
  2. Step 2: Convert to fraction form
    20,768.12/31,150.67 = 8,115.50/x
  3. Step 3: Cross multiply
    20,768.12x = 31,150.67 × 8,115.50
  4. Step 4: Simplify right side
    20,768.12x = 252,803,262.39
  5. Step 5: Solve for x
    x = 252,803,262.39/20,768.12
  6. Step 6: Final answer
    x = 12,172.66

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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.