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Finding the Fourth Proportional to 484.45, 668.79 and 287.96

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Solution

The fourth proportional to 484.45, 668.79 and 287.96 is: 397.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.45 : 668.79 = 287.96 : x
  2. Step 2: Convert to fraction form
    484.45/668.79 = 287.96/x
  3. Step 3: Cross multiply
    484.45x = 668.79 × 287.96
  4. Step 4: Simplify right side
    484.45x = 192,581.42
  5. Step 5: Solve for x
    x = 192,581.42/484.45
  6. Step 6: Final answer
    x = 397.53

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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.