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Finding the Fourth Proportional to 68,121.80, 102,078.60 and 28,657.28

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Solution

The fourth proportional to 68,121.80, 102,078.60 and 28,657.28 is: 42,942.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,121.80 : 102,078.60 = 28,657.28 : x
  2. Step 2: Convert to fraction form
    68,121.80/102,078.60 = 28,657.28/x
  3. Step 3: Cross multiply
    68,121.80x = 102,078.60 × 28,657.28
  4. Step 4: Simplify right side
    68,121.80x = 2,925,295,022.21
  5. Step 5: Solve for x
    x = 2,925,295,022.21/68,121.80
  6. Step 6: Final answer
    x = 42,942.13

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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.