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Finding the Fourth Proportional to 236.79, 355.32 and 128.64

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Solution

The fourth proportional to 236.79, 355.32 and 128.64 is: 193.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.79 : 355.32 = 128.64 : x
  2. Step 2: Convert to fraction form
    236.79/355.32 = 128.64/x
  3. Step 3: Cross multiply
    236.79x = 355.32 × 128.64
  4. Step 4: Simplify right side
    236.79x = 45,708.36
  5. Step 5: Solve for x
    x = 45,708.36/236.79
  6. Step 6: Final answer
    x = 193.03

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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.