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Finding the Fourth Proportional to 408.37, 611.40 and 318.12

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Solution

The fourth proportional to 408.37, 611.40 and 318.12 is: 476.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.37 : 611.40 = 318.12 : x
  2. Step 2: Convert to fraction form
    408.37/611.40 = 318.12/x
  3. Step 3: Cross multiply
    408.37x = 611.40 × 318.12
  4. Step 4: Simplify right side
    408.37x = 194,498.57
  5. Step 5: Solve for x
    x = 194,498.57/408.37
  6. Step 6: Final answer
    x = 476.28

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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.