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Finding the Fourth Proportional to 18,959.47, 28,442.84 and 5,811.96

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Solution

The fourth proportional to 18,959.47, 28,442.84 and 5,811.96 is: 8,719.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,959.47 : 28,442.84 = 5,811.96 : x
  2. Step 2: Convert to fraction form
    18,959.47/28,442.84 = 5,811.96/x
  3. Step 3: Cross multiply
    18,959.47x = 28,442.84 × 5,811.96
  4. Step 4: Simplify right side
    18,959.47x = 165,308,648.37
  5. Step 5: Solve for x
    x = 165,308,648.37/18,959.47
  6. Step 6: Final answer
    x = 8,719.05

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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.