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Finding the Fourth Proportional to 18,761.34, 28,128.04 and 11,364.02

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Solution

The fourth proportional to 18,761.34, 28,128.04 and 11,364.02 is: 17,037.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.34 : 28,128.04 = 11,364.02 : x
  2. Step 2: Convert to fraction form
    18,761.34/28,128.04 = 11,364.02/x
  3. Step 3: Cross multiply
    18,761.34x = 28,128.04 × 11,364.02
  4. Step 4: Simplify right side
    18,761.34x = 319,647,440.07
  5. Step 5: Solve for x
    x = 319,647,440.07/18,761.34
  6. Step 6: Final answer
    x = 17,037.56

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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.