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Finding the Fourth Proportional to 484.40, 668.30 and 287.80

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Solution

The fourth proportional to 484.40, 668.30 and 287.80 is: 397.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.40 : 668.30 = 287.80 : x
  2. Step 2: Convert to fraction form
    484.40/668.30 = 287.80/x
  3. Step 3: Cross multiply
    484.40x = 668.30 × 287.80
  4. Step 4: Simplify right side
    484.40x = 192,336.74
  5. Step 5: Solve for x
    x = 192,336.74/484.40
  6. Step 6: Final answer
    x = 397.06

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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.