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Finding the Fourth Proportional to 18,978.93, 28,478.68 and 7,893.27

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Solution

The fourth proportional to 18,978.93, 28,478.68 and 7,893.27 is: 11,844.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.93 : 28,478.68 = 7,893.27 : x
  2. Step 2: Convert to fraction form
    18,978.93/28,478.68 = 7,893.27/x
  3. Step 3: Cross multiply
    18,978.93x = 28,478.68 × 7,893.27
  4. Step 4: Simplify right side
    18,978.93x = 224,789,890.75
  5. Step 5: Solve for x
    x = 224,789,890.75/18,978.93
  6. Step 6: Final answer
    x = 11,844.18

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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.