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Finding the Fourth Proportional to 309.94, 427.74 and 199.67

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Solution

The fourth proportional to 309.94, 427.74 and 199.67 is: 275.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.94 : 427.74 = 199.67 : x
  2. Step 2: Convert to fraction form
    309.94/427.74 = 199.67/x
  3. Step 3: Cross multiply
    309.94x = 427.74 × 199.67
  4. Step 4: Simplify right side
    309.94x = 85,407.92
  5. Step 5: Solve for x
    x = 85,407.92/309.94
  6. Step 6: Final answer
    x = 275.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.