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Finding the Fourth Proportional to 18,791.25, 28,188.54 and 4,940.25

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Solution

The fourth proportional to 18,791.25, 28,188.54 and 4,940.25 is: 7,410.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,791.25 : 28,188.54 = 4,940.25 : x
  2. Step 2: Convert to fraction form
    18,791.25/28,188.54 = 4,940.25/x
  3. Step 3: Cross multiply
    18,791.25x = 28,188.54 × 4,940.25
  4. Step 4: Simplify right side
    18,791.25x = 139,258,434.74
  5. Step 5: Solve for x
    x = 139,258,434.74/18,791.25
  6. Step 6: Final answer
    x = 7,410.81

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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.