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Finding the Fourth Proportional to 855.43, 1,283.21 and 307.61

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Solution

The fourth proportional to 855.43, 1,283.21 and 307.61 is: 461.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.43 : 1,283.21 = 307.61 : x
  2. Step 2: Convert to fraction form
    855.43/1,283.21 = 307.61/x
  3. Step 3: Cross multiply
    855.43x = 1,283.21 × 307.61
  4. Step 4: Simplify right side
    855.43x = 394,729.90
  5. Step 5: Solve for x
    x = 394,729.90/855.43
  6. Step 6: Final answer
    x = 461.44

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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.