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Finding the Fourth Proportional to 1,191.45, 1,787.31 and 460.92

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Solution

The fourth proportional to 1,191.45, 1,787.31 and 460.92 is: 691.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.45 : 1,787.31 = 460.92 : x
  2. Step 2: Convert to fraction form
    1,191.45/1,787.31 = 460.92/x
  3. Step 3: Cross multiply
    1,191.45x = 1,787.31 × 460.92
  4. Step 4: Simplify right side
    1,191.45x = 823,806.93
  5. Step 5: Solve for x
    x = 823,806.93/1,191.45
  6. Step 6: Final answer
    x = 691.43

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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.