Home / 20,719.24-31,078.83-5,136.86

Finding the Fourth Proportional to 20,719.24, 31,078.83 and 5,136.86

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Solution

The fourth proportional to 20,719.24, 31,078.83 and 5,136.86 is: 7,705.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,719.24 : 31,078.83 = 5,136.86 : x
  2. Step 2: Convert to fraction form
    20,719.24/31,078.83 = 5,136.86/x
  3. Step 3: Cross multiply
    20,719.24x = 31,078.83 × 5,136.86
  4. Step 4: Simplify right side
    20,719.24x = 159,647,598.67
  5. Step 5: Solve for x
    x = 159,647,598.67/20,719.24
  6. Step 6: Final answer
    x = 7,705.28

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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.