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Finding the Fourth Proportional to 18,957.21, 28,441.28 and 5,811.52

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Solution

The fourth proportional to 18,957.21, 28,441.28 and 5,811.52 is: 8,718.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,957.21 : 28,441.28 = 5,811.52 : x
  2. Step 2: Convert to fraction form
    18,957.21/28,441.28 = 5,811.52/x
  3. Step 3: Cross multiply
    18,957.21x = 28,441.28 × 5,811.52
  4. Step 4: Simplify right side
    18,957.21x = 165,287,067.55
  5. Step 5: Solve for x
    x = 165,287,067.55/18,957.21
  6. Step 6: Final answer
    x = 8,718.96

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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.