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Finding the Fourth Proportional to 855.79, 1,283.51 and 270.84

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Solution

The fourth proportional to 855.79, 1,283.51 and 270.84 is: 406.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.79 : 1,283.51 = 270.84 : x
  2. Step 2: Convert to fraction form
    855.79/1,283.51 = 270.84/x
  3. Step 3: Cross multiply
    855.79x = 1,283.51 × 270.84
  4. Step 4: Simplify right side
    855.79x = 347,625.85
  5. Step 5: Solve for x
    x = 347,625.85/855.79
  6. Step 6: Final answer
    x = 406.20

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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.