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Finding the Fourth Proportional to 18,651.86, 27,978.33 and 4,611.87

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Solution

The fourth proportional to 18,651.86, 27,978.33 and 4,611.87 is: 6,917.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,651.86 : 27,978.33 = 4,611.87 : x
  2. Step 2: Convert to fraction form
    18,651.86/27,978.33 = 4,611.87/x
  3. Step 3: Cross multiply
    18,651.86x = 27,978.33 × 4,611.87
  4. Step 4: Simplify right side
    18,651.86x = 129,032,420.78
  5. Step 5: Solve for x
    x = 129,032,420.78/18,651.86
  6. Step 6: Final answer
    x = 6,917.94

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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.