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Finding the Fourth Proportional to 28,661.63, 42,997.30 and 8,936.26

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Solution

The fourth proportional to 28,661.63, 42,997.30 and 8,936.26 is: 13,405.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,661.63 : 42,997.30 = 8,936.26 : x
  2. Step 2: Convert to fraction form
    28,661.63/42,997.30 = 8,936.26/x
  3. Step 3: Cross multiply
    28,661.63x = 42,997.30 × 8,936.26
  4. Step 4: Simplify right side
    28,661.63x = 384,234,922.26
  5. Step 5: Solve for x
    x = 384,234,922.26/28,661.63
  6. Step 6: Final answer
    x = 13,405.90

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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.