Home / 20,579.30-28,399.56-11,147.86

Finding the Fourth Proportional to 20,579.30, 28,399.56 and 11,147.86

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Solution

The fourth proportional to 20,579.30, 28,399.56 and 11,147.86 is: 15,384.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,579.30 : 28,399.56 = 11,147.86 : x
  2. Step 2: Convert to fraction form
    20,579.30/28,399.56 = 11,147.86/x
  3. Step 3: Cross multiply
    20,579.30x = 28,399.56 × 11,147.86
  4. Step 4: Simplify right side
    20,579.30x = 316,594,176.94
  5. Step 5: Solve for x
    x = 316,594,176.94/20,579.30
  6. Step 6: Final answer
    x = 15,384.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.