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Finding the Fourth Proportional to 18,321.63, 27,486.09 and 7,791.57

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Solution

The fourth proportional to 18,321.63, 27,486.09 and 7,791.57 is: 11,688.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,321.63 : 27,486.09 = 7,791.57 : x
  2. Step 2: Convert to fraction form
    18,321.63/27,486.09 = 7,791.57/x
  3. Step 3: Cross multiply
    18,321.63x = 27,486.09 × 7,791.57
  4. Step 4: Simplify right side
    18,321.63x = 214,159,794.26
  5. Step 5: Solve for x
    x = 214,159,794.26/18,321.63
  6. Step 6: Final answer
    x = 11,688.91

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1.5x scale

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.