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Finding the Fourth Proportional to 238.40, 357.73 and 128.60

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Solution

The fourth proportional to 238.40, 357.73 and 128.60 is: 192.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.40 : 357.73 = 128.60 : x
  2. Step 2: Convert to fraction form
    238.40/357.73 = 128.60/x
  3. Step 3: Cross multiply
    238.40x = 357.73 × 128.60
  4. Step 4: Simplify right side
    238.40x = 46,004.65
  5. Step 5: Solve for x
    x = 46,004.65/238.40
  6. Step 6: Final answer
    x = 192.97

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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.