Home / 20,691.40-31,040.52-8,211.50

Finding the Fourth Proportional to 20,691.40, 31,040.52 and 8,211.50

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Solution

The fourth proportional to 20,691.40, 31,040.52 and 8,211.50 is: 12,318.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,691.40 : 31,040.52 = 8,211.50 : x
  2. Step 2: Convert to fraction form
    20,691.40/31,040.52 = 8,211.50/x
  3. Step 3: Cross multiply
    20,691.40x = 31,040.52 × 8,211.50
  4. Step 4: Simplify right side
    20,691.40x = 254,889,229.98
  5. Step 5: Solve for x
    x = 254,889,229.98/20,691.40
  6. Step 6: Final answer
    x = 12,318.61

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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.