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Finding the Fourth Proportional to 484.82, 668.64 and 391.54

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Solution

The fourth proportional to 484.82, 668.64 and 391.54 is: 539.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.82 : 668.64 = 391.54 : x
  2. Step 2: Convert to fraction form
    484.82/668.64 = 391.54/x
  3. Step 3: Cross multiply
    484.82x = 668.64 × 391.54
  4. Step 4: Simplify right side
    484.82x = 261,799.31
  5. Step 5: Solve for x
    x = 261,799.31/484.82
  6. Step 6: Final answer
    x = 539.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.