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Finding the Fourth Proportional to 608.88, 911.95 and 427.09

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Solution

The fourth proportional to 608.88, 911.95 and 427.09 is: 639.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.88 : 911.95 = 427.09 : x
  2. Step 2: Convert to fraction form
    608.88/911.95 = 427.09/x
  3. Step 3: Cross multiply
    608.88x = 911.95 × 427.09
  4. Step 4: Simplify right side
    608.88x = 389,481.38
  5. Step 5: Solve for x
    x = 389,481.38/608.88
  6. Step 6: Final answer
    x = 639.67

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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.