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Finding the Fourth Proportional to 528.78, 791.98 and 255.08

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Solution

The fourth proportional to 528.78, 791.98 and 255.08 is: 382.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.78 : 791.98 = 255.08 : x
  2. Step 2: Convert to fraction form
    528.78/791.98 = 255.08/x
  3. Step 3: Cross multiply
    528.78x = 791.98 × 255.08
  4. Step 4: Simplify right side
    528.78x = 202,013.66
  5. Step 5: Solve for x
    x = 202,013.66/528.78
  6. Step 6: Final answer
    x = 382.04

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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.