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Finding the Fourth Proportional to 18,961.78, 28,442.80 and 12,429.32

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Solution

The fourth proportional to 18,961.78, 28,442.80 and 12,429.32 is: 18,644.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,961.78 : 28,442.80 = 12,429.32 : x
  2. Step 2: Convert to fraction form
    18,961.78/28,442.80 = 12,429.32/x
  3. Step 3: Cross multiply
    18,961.78x = 28,442.80 × 12,429.32
  4. Step 4: Simplify right side
    18,961.78x = 353,524,662.90
  5. Step 5: Solve for x
    x = 353,524,662.90/18,961.78
  6. Step 6: Final answer
    x = 18,644.07

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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.