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Finding the Fourth Proportional to 238.12, 357.72 and 205.72

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Solution

The fourth proportional to 238.12, 357.72 and 205.72 is: 309.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.12 : 357.72 = 205.72 : x
  2. Step 2: Convert to fraction form
    238.12/357.72 = 205.72/x
  3. Step 3: Cross multiply
    238.12x = 357.72 × 205.72
  4. Step 4: Simplify right side
    238.12x = 73,590.16
  5. Step 5: Solve for x
    x = 73,590.16/238.12
  6. Step 6: Final answer
    x = 309.05

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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.