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Finding the Fourth Proportional to 238.57, 357.75 and 76.21

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Solution

The fourth proportional to 238.57, 357.75 and 76.21 is: 114.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.57 : 357.75 = 76.21 : x
  2. Step 2: Convert to fraction form
    238.57/357.75 = 76.21/x
  3. Step 3: Cross multiply
    238.57x = 357.75 × 76.21
  4. Step 4: Simplify right side
    238.57x = 27,262.34
  5. Step 5: Solve for x
    x = 27,262.34/238.57
  6. Step 6: Final answer
    x = 114.28

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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.