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Finding the Fourth Proportional to 528.61, 791.39 and 308.57

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Solution

The fourth proportional to 528.61, 791.39 and 308.57 is: 461.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.61 : 791.39 = 308.57 : x
  2. Step 2: Convert to fraction form
    528.61/791.39 = 308.57/x
  3. Step 3: Cross multiply
    528.61x = 791.39 × 308.57
  4. Step 4: Simplify right side
    528.61x = 244,199.21
  5. Step 5: Solve for x
    x = 244,199.21/528.61
  6. Step 6: Final answer
    x = 461.96

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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.