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Finding the Fourth Proportional to 484.38, 667.89 and 318.51

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Solution

The fourth proportional to 484.38, 667.89 and 318.51 is: 439.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.38 : 667.89 = 318.51 : x
  2. Step 2: Convert to fraction form
    484.38/667.89 = 318.51/x
  3. Step 3: Cross multiply
    484.38x = 667.89 × 318.51
  4. Step 4: Simplify right side
    484.38x = 212,729.64
  5. Step 5: Solve for x
    x = 212,729.64/484.38
  6. Step 6: Final answer
    x = 439.18

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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.