Home / 20,861.70-31,289.28-6,821.61

Finding the Fourth Proportional to 20,861.70, 31,289.28 and 6,821.61

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Solution

The fourth proportional to 20,861.70, 31,289.28 and 6,821.61 is: 10,231.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.70 : 31,289.28 = 6,821.61 : x
  2. Step 2: Convert to fraction form
    20,861.70/31,289.28 = 6,821.61/x
  3. Step 3: Cross multiply
    20,861.70x = 31,289.28 × 6,821.61
  4. Step 4: Simplify right side
    20,861.70x = 213,443,265.34
  5. Step 5: Solve for x
    x = 213,443,265.34/20,861.70
  6. Step 6: Final answer
    x = 10,231.35

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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.