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Finding the Fourth Proportional to 855.70, 1,283.43 and 270.56

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Solution

The fourth proportional to 855.70, 1,283.43 and 270.56 is: 405.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.70 : 1,283.43 = 270.56 : x
  2. Step 2: Convert to fraction form
    855.70/1,283.43 = 270.56/x
  3. Step 3: Cross multiply
    855.70x = 1,283.43 × 270.56
  4. Step 4: Simplify right side
    855.70x = 347,244.82
  5. Step 5: Solve for x
    x = 347,244.82/855.70
  6. Step 6: Final answer
    x = 405.80

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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.