Home / 20,812.72-28,719.96-11,858.44

Finding the Fourth Proportional to 20,812.72, 28,719.96 and 11,858.44

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Solution

The fourth proportional to 20,812.72, 28,719.96 and 11,858.44 is: 16,363.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.72 : 28,719.96 = 11,858.44 : x
  2. Step 2: Convert to fraction form
    20,812.72/28,719.96 = 11,858.44/x
  3. Step 3: Cross multiply
    20,812.72x = 28,719.96 × 11,858.44
  4. Step 4: Simplify right side
    20,812.72x = 340,573,922.46
  5. Step 5: Solve for x
    x = 340,573,922.46/20,812.72
  6. Step 6: Final answer
    x = 16,363.74

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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.