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Finding the Fourth Proportional to 484.20, 668.20 and 274.45

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Solution

The fourth proportional to 484.20, 668.20 and 274.45 is: 378.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.20 : 668.20 = 274.45 : x
  2. Step 2: Convert to fraction form
    484.20/668.20 = 274.45/x
  3. Step 3: Cross multiply
    484.20x = 668.20 × 274.45
  4. Step 4: Simplify right side
    484.20x = 183,387.49
  5. Step 5: Solve for x
    x = 183,387.49/484.20
  6. Step 6: Final answer
    x = 378.74

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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.