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Finding the Fourth Proportional to 352.70, 528.84 and 261.39

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Solution

The fourth proportional to 352.70, 528.84 and 261.39 is: 391.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.70 : 528.84 = 261.39 : x
  2. Step 2: Convert to fraction form
    352.70/528.84 = 261.39/x
  3. Step 3: Cross multiply
    352.70x = 528.84 × 261.39
  4. Step 4: Simplify right side
    352.70x = 138,233.49
  5. Step 5: Solve for x
    x = 138,233.49/352.70
  6. Step 6: Final answer
    x = 391.93

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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.