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Finding the Fourth Proportional to 318, 477.09 and 135.43

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Solution

The fourth proportional to 318, 477.09 and 135.43 is: 203.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    318 : 477.09 = 135.43 : x
  2. Step 2: Convert to fraction form
    318/477.09 = 135.43/x
  3. Step 3: Cross multiply
    318x = 477.09 × 135.43
  4. Step 4: Simplify right side
    318x = 64,612.30
  5. Step 5: Solve for x
    x = 64,612.30/318
  6. Step 6: Final answer
    x = 203.18

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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.