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Finding the Fourth Proportional to 238.64, 357.75 and 128.84

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Solution

The fourth proportional to 238.64, 357.75 and 128.84 is: 193.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.64 : 357.75 = 128.84 : x
  2. Step 2: Convert to fraction form
    238.64/357.75 = 128.84/x
  3. Step 3: Cross multiply
    238.64x = 357.75 × 128.84
  4. Step 4: Simplify right side
    238.64x = 46,090.72
  5. Step 5: Solve for x
    x = 46,090.72/238.64
  6. Step 6: Final answer
    x = 193.14

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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.