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Finding the Fourth Proportional to 318.24, 477.36 and 135.79

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Solution

The fourth proportional to 318.24, 477.36 and 135.79 is: 203.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.24 : 477.36 = 135.79 : x
  2. Step 2: Convert to fraction form
    318.24/477.36 = 135.79/x
  3. Step 3: Cross multiply
    318.24x = 477.36 × 135.79
  4. Step 4: Simplify right side
    318.24x = 64,819.52
  5. Step 5: Solve for x
    x = 64,819.52/318.24
  6. Step 6: Final answer
    x = 203.68

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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.