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Finding the Fourth Proportional to 209.69, 314.64 and 127.44

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Solution

The fourth proportional to 209.69, 314.64 and 127.44 is: 191.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.69 : 314.64 = 127.44 : x
  2. Step 2: Convert to fraction form
    209.69/314.64 = 127.44/x
  3. Step 3: Cross multiply
    209.69x = 314.64 × 127.44
  4. Step 4: Simplify right side
    209.69x = 40,097.72
  5. Step 5: Solve for x
    x = 40,097.72/209.69
  6. Step 6: Final answer
    x = 191.22

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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.