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Finding the Fourth Proportional to 209.44, 314.36 and 128.44

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Solution

The fourth proportional to 209.44, 314.36 and 128.44 is: 192.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.44 : 314.36 = 128.44 : x
  2. Step 2: Convert to fraction form
    209.44/314.36 = 128.44/x
  3. Step 3: Cross multiply
    209.44x = 314.36 × 128.44
  4. Step 4: Simplify right side
    209.44x = 40,376.40
  5. Step 5: Solve for x
    x = 40,376.40/209.44
  6. Step 6: Final answer
    x = 192.78

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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.