Home / 12,277.20-18,379.35-8,121.90

Finding the Fourth Proportional to 12,277.20, 18,379.35 and 8,121.90

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Solution

The fourth proportional to 12,277.20, 18,379.35 and 8,121.90 is: 12,158.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,277.20 : 18,379.35 = 8,121.90 : x
  2. Step 2: Convert to fraction form
    12,277.20/18,379.35 = 8,121.90/x
  3. Step 3: Cross multiply
    12,277.20x = 18,379.35 × 8,121.90
  4. Step 4: Simplify right side
    12,277.20x = 149,275,242.77
  5. Step 5: Solve for x
    x = 149,275,242.77/12,277.20
  6. Step 6: Final answer
    x = 12,158.74

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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.