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Finding the Fourth Proportional to 1,191.82, 1,787.97 and 422.86

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Solution

The fourth proportional to 1,191.82, 1,787.97 and 422.86 is: 634.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.82 : 1,787.97 = 422.86 : x
  2. Step 2: Convert to fraction form
    1,191.82/1,787.97 = 422.86/x
  3. Step 3: Cross multiply
    1,191.82x = 1,787.97 × 422.86
  4. Step 4: Simplify right side
    1,191.82x = 756,060.99
  5. Step 5: Solve for x
    x = 756,060.99/1,191.82
  6. Step 6: Final answer
    x = 634.38

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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.