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Finding the Fourth Proportional to 56,910.92, 85,375.64 and 21,375

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Solution

The fourth proportional to 56,910.92, 85,375.64 and 21,375 is: 32,065.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,910.92 : 85,375.64 = 21,375 : x
  2. Step 2: Convert to fraction form
    56,910.92/85,375.64 = 21,375/x
  3. Step 3: Cross multiply
    56,910.92x = 85,375.64 × 21,375
  4. Step 4: Simplify right side
    56,910.92x = 1,824,904,198.13
  5. Step 5: Solve for x
    x = 1,824,904,198.13/56,910.92
  6. Step 6: Final answer
    x = 32,065.98

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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.