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Finding the Fourth Proportional to 358.44, 495.09 and 309.30

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Solution

The fourth proportional to 358.44, 495.09 and 309.30 is: 427.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.44 : 495.09 = 309.30 : x
  2. Step 2: Convert to fraction form
    358.44/495.09 = 309.30/x
  3. Step 3: Cross multiply
    358.44x = 495.09 × 309.30
  4. Step 4: Simplify right side
    358.44x = 153,131.34
  5. Step 5: Solve for x
    x = 153,131.34/358.44
  6. Step 6: Final answer
    x = 427.22

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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.