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Finding the Fourth Proportional to 318.68, 478 and 135.98

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Solution

The fourth proportional to 318.68, 478 and 135.98 is: 203.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.68 : 478 = 135.98 : x
  2. Step 2: Convert to fraction form
    318.68/478 = 135.98/x
  3. Step 3: Cross multiply
    318.68x = 478 × 135.98
  4. Step 4: Simplify right side
    318.68x = 64,998.44
  5. Step 5: Solve for x
    x = 64,998.44/318.68
  6. Step 6: Final answer
    x = 203.96

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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.