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Finding the Fourth Proportional to 1,906.38, 2,861.13 and 811.98

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Solution

The fourth proportional to 1,906.38, 2,861.13 and 811.98 is: 1,218.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,906.38 : 2,861.13 = 811.98 : x
  2. Step 2: Convert to fraction form
    1,906.38/2,861.13 = 811.98/x
  3. Step 3: Cross multiply
    1,906.38x = 2,861.13 × 811.98
  4. Step 4: Simplify right side
    1,906.38x = 2,323,180.34
  5. Step 5: Solve for x
    x = 2,323,180.34/1,906.38
  6. Step 6: Final answer
    x = 1,218.63

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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.