Home / 20,668.24-30,989.74-8,815.36

Finding the Fourth Proportional to 20,668.24, 30,989.74 and 8,815.36

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Solution

The fourth proportional to 20,668.24, 30,989.74 and 8,815.36 is: 13,217.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,668.24 : 30,989.74 = 8,815.36 : x
  2. Step 2: Convert to fraction form
    20,668.24/30,989.74 = 8,815.36/x
  3. Step 3: Cross multiply
    20,668.24x = 30,989.74 × 8,815.36
  4. Step 4: Simplify right side
    20,668.24x = 273,185,714.41
  5. Step 5: Solve for x
    x = 273,185,714.41/20,668.24
  6. Step 6: Final answer
    x = 13,217.66

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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.