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Finding the Fourth Proportional to 318.09, 477.09 and 144.75

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Solution

The fourth proportional to 318.09, 477.09 and 144.75 is: 217.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.09 : 477.09 = 144.75 : x
  2. Step 2: Convert to fraction form
    318.09/477.09 = 144.75/x
  3. Step 3: Cross multiply
    318.09x = 477.09 × 144.75
  4. Step 4: Simplify right side
    318.09x = 69,060.57
  5. Step 5: Solve for x
    x = 69,060.57/318.09
  6. Step 6: Final answer
    x = 217.11

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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.