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Finding the Fourth Proportional to 18,368.71, 27,531.19 and 12,791.86

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Solution

The fourth proportional to 18,368.71, 27,531.19 and 12,791.86 is: 19,172.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,368.71 : 27,531.19 = 12,791.86 : x
  2. Step 2: Convert to fraction form
    18,368.71/27,531.19 = 12,791.86/x
  3. Step 3: Cross multiply
    18,368.71x = 27,531.19 × 12,791.86
  4. Step 4: Simplify right side
    18,368.71x = 352,174,958.48
  5. Step 5: Solve for x
    x = 352,174,958.48/18,368.71
  6. Step 6: Final answer
    x = 19,172.55

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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.