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Finding the Fourth Proportional to 356, 491.38 and 238.20

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Solution

The fourth proportional to 356, 491.38 and 238.20 is: 328.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    356 : 491.38 = 238.20 : x
  2. Step 2: Convert to fraction form
    356/491.38 = 238.20/x
  3. Step 3: Cross multiply
    356x = 491.38 × 238.20
  4. Step 4: Simplify right side
    356x = 117,046.72
  5. Step 5: Solve for x
    x = 117,046.72/356
  6. Step 6: Final answer
    x = 328.78

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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.