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Finding the Fourth Proportional to 356.16, 491.24 and 238.09

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Solution

The fourth proportional to 356.16, 491.24 and 238.09 is: 328.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.16 : 491.24 = 238.09 : x
  2. Step 2: Convert to fraction form
    356.16/491.24 = 238.09/x
  3. Step 3: Cross multiply
    356.16x = 491.24 × 238.09
  4. Step 4: Simplify right side
    356.16x = 116,959.33
  5. Step 5: Solve for x
    x = 116,959.33/356.16
  6. Step 6: Final answer
    x = 328.39

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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.