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Finding the Fourth Proportional to 208.98, 312.66 and 127.44

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Solution

The fourth proportional to 208.98, 312.66 and 127.44 is: 190.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.98 : 312.66 = 127.44 : x
  2. Step 2: Convert to fraction form
    208.98/312.66 = 127.44/x
  3. Step 3: Cross multiply
    208.98x = 312.66 × 127.44
  4. Step 4: Simplify right side
    208.98x = 39,845.39
  5. Step 5: Solve for x
    x = 39,845.39/208.98
  6. Step 6: Final answer
    x = 190.67

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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.