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Finding the Fourth Proportional to 318.31, 477.55 and 135.83

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Solution

The fourth proportional to 318.31, 477.55 and 135.83 is: 203.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.31 : 477.55 = 135.83 : x
  2. Step 2: Convert to fraction form
    318.31/477.55 = 135.83/x
  3. Step 3: Cross multiply
    318.31x = 477.55 × 135.83
  4. Step 4: Simplify right side
    318.31x = 64,867.41
  5. Step 5: Solve for x
    x = 64,867.41/318.31
  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.