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Finding the Fourth Proportional to 484.74, 668.48 and 318.88

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Solution

The fourth proportional to 484.74, 668.48 and 318.88 is: 439.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.74 : 668.48 = 318.88 : x
  2. Step 2: Convert to fraction form
    484.74/668.48 = 318.88/x
  3. Step 3: Cross multiply
    484.74x = 668.48 × 318.88
  4. Step 4: Simplify right side
    484.74x = 213,164.90
  5. Step 5: Solve for x
    x = 213,164.90/484.74
  6. Step 6: Final answer
    x = 439.75

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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.