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Finding the Fourth Proportional to 18,790.86, 28,186.50 and 4,939.86

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Solution

The fourth proportional to 18,790.86, 28,186.50 and 4,939.86 is: 7,409.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,790.86 : 28,186.50 = 4,939.86 : x
  2. Step 2: Convert to fraction form
    18,790.86/28,186.50 = 4,939.86/x
  3. Step 3: Cross multiply
    18,790.86x = 28,186.50 × 4,939.86
  4. Step 4: Simplify right side
    18,790.86x = 139,237,363.89
  5. Step 5: Solve for x
    x = 139,237,363.89/18,790.86
  6. Step 6: Final answer
    x = 7,409.85

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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.