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Finding the Fourth Proportional to 18,815.76, 28,205.42 and 8,952.39

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Solution

The fourth proportional to 18,815.76, 28,205.42 and 8,952.39 is: 13,419.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,815.76 : 28,205.42 = 8,952.39 : x
  2. Step 2: Convert to fraction form
    18,815.76/28,205.42 = 8,952.39/x
  3. Step 3: Cross multiply
    18,815.76x = 28,205.42 × 8,952.39
  4. Step 4: Simplify right side
    18,815.76x = 252,505,875.19
  5. Step 5: Solve for x
    x = 252,505,875.19/18,815.76
  6. Step 6: Final answer
    x = 13,419.91

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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.