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Finding the Fourth Proportional to 352.98, 528.39 and 261.45

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Solution

The fourth proportional to 352.98, 528.39 and 261.45 is: 391.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.98 : 528.39 = 261.45 : x
  2. Step 2: Convert to fraction form
    352.98/528.39 = 261.45/x
  3. Step 3: Cross multiply
    352.98x = 528.39 × 261.45
  4. Step 4: Simplify right side
    352.98x = 138,147.57
  5. Step 5: Solve for x
    x = 138,147.57/352.98
  6. Step 6: Final answer
    x = 391.38

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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.