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Finding the Fourth Proportional to 238.16, 357.28 and 75.81

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Solution

The fourth proportional to 238.16, 357.28 and 75.81 is: 113.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.16 : 357.28 = 75.81 : x
  2. Step 2: Convert to fraction form
    238.16/357.28 = 75.81/x
  3. Step 3: Cross multiply
    238.16x = 357.28 × 75.81
  4. Step 4: Simplify right side
    238.16x = 27,083.23
  5. Step 5: Solve for x
    x = 27,083.23/238.16
  6. Step 6: Final answer
    x = 113.72

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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.