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Finding the Fourth Proportional to 18,716.64, 28,071.12 and 7,029.60

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Solution

The fourth proportional to 18,716.64, 28,071.12 and 7,029.60 is: 10,542.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,716.64 : 28,071.12 = 7,029.60 : x
  2. Step 2: Convert to fraction form
    18,716.64/28,071.12 = 7,029.60/x
  3. Step 3: Cross multiply
    18,716.64x = 28,071.12 × 7,029.60
  4. Step 4: Simplify right side
    18,716.64x = 197,328,745.15
  5. Step 5: Solve for x
    x = 197,328,745.15/18,716.64
  6. Step 6: Final answer
    x = 10,542.96

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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.