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Finding the Fourth Proportional to 427.44, 590.21 and 318.09

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Solution

The fourth proportional to 427.44, 590.21 and 318.09 is: 439.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.44 : 590.21 = 318.09 : x
  2. Step 2: Convert to fraction form
    427.44/590.21 = 318.09/x
  3. Step 3: Cross multiply
    427.44x = 590.21 × 318.09
  4. Step 4: Simplify right side
    427.44x = 187,738.31
  5. Step 5: Solve for x
    x = 187,738.31/427.44
  6. Step 6: Final answer
    x = 439.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.