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Finding the Fourth Proportional to 208.85, 313.05 and 127.75

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Solution

The fourth proportional to 208.85, 313.05 and 127.75 is: 191.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.85 : 313.05 = 127.75 : x
  2. Step 2: Convert to fraction form
    208.85/313.05 = 127.75/x
  3. Step 3: Cross multiply
    208.85x = 313.05 × 127.75
  4. Step 4: Simplify right side
    208.85x = 39,990.57
  5. Step 5: Solve for x
    x = 39,990.57/208.85
  6. Step 6: Final answer
    x = 191.48

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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.