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Finding the Fourth Proportional to 318.55, 477.71 and 135.89

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Solution

The fourth proportional to 318.55, 477.71 and 135.89 is: 203.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.55 : 477.71 = 135.89 : x
  2. Step 2: Convert to fraction form
    318.55/477.71 = 135.89/x
  3. Step 3: Cross multiply
    318.55x = 477.71 × 135.89
  4. Step 4: Simplify right side
    318.55x = 64,915.33
  5. Step 5: Solve for x
    x = 64,915.33/318.55
  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.