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Finding the Fourth Proportional to 609.21, 840.68 and 343.67

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Solution

The fourth proportional to 609.21, 840.68 and 343.67 is: 474.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.21 : 840.68 = 343.67 : x
  2. Step 2: Convert to fraction form
    609.21/840.68 = 343.67/x
  3. Step 3: Cross multiply
    609.21x = 840.68 × 343.67
  4. Step 4: Simplify right side
    609.21x = 288,910.57
  5. Step 5: Solve for x
    x = 288,910.57/609.21
  6. Step 6: Final answer
    x = 474.24

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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.