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Finding the Fourth Proportional to 18,791.36, 28,188.48 and 4,940

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Solution

The fourth proportional to 18,791.36, 28,188.48 and 4,940 is: 7,410.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,791.36 : 28,188.48 = 4,940 : x
  2. Step 2: Convert to fraction form
    18,791.36/28,188.48 = 4,940/x
  3. Step 3: Cross multiply
    18,791.36x = 28,188.48 × 4,940
  4. Step 4: Simplify right side
    18,791.36x = 139,251,091.20
  5. Step 5: Solve for x
    x = 139,251,091.20/18,791.36
  6. Step 6: Final answer
    x = 7,410.38

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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.