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Finding the Fourth Proportional to 318.44, 477.69 and 135.85

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Solution

The fourth proportional to 318.44, 477.69 and 135.85 is: 203.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.44 : 477.69 = 135.85 : x
  2. Step 2: Convert to fraction form
    318.44/477.69 = 135.85/x
  3. Step 3: Cross multiply
    318.44x = 477.69 × 135.85
  4. Step 4: Simplify right side
    318.44x = 64,894.19
  5. Step 5: Solve for x
    x = 64,894.19/318.44
  6. Step 6: Final answer
    x = 203.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.