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Finding the Fourth Proportional to 484.75, 668.91 and 288.31

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Solution

The fourth proportional to 484.75, 668.91 and 288.31 is: 397.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.75 : 668.91 = 288.31 : x
  2. Step 2: Convert to fraction form
    484.75/668.91 = 288.31/x
  3. Step 3: Cross multiply
    484.75x = 668.91 × 288.31
  4. Step 4: Simplify right side
    484.75x = 192,853.44
  5. Step 5: Solve for x
    x = 192,853.44/484.75
  6. Step 6: Final answer
    x = 397.84

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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.