Home / 12,219.34-18,321.45-8,311.90

Finding the Fourth Proportional to 12,219.34, 18,321.45 and 8,311.90

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Solution

The fourth proportional to 12,219.34, 18,321.45 and 8,311.90 is: 12,462.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,219.34 : 18,321.45 = 8,311.90 : x
  2. Step 2: Convert to fraction form
    12,219.34/18,321.45 = 8,311.90/x
  3. Step 3: Cross multiply
    12,219.34x = 18,321.45 × 8,311.90
  4. Step 4: Simplify right side
    12,219.34x = 152,286,060.26
  5. Step 5: Solve for x
    x = 152,286,060.26/12,219.34
  6. Step 6: Final answer
    x = 12,462.71

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1.5x scale

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.