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Finding the Fourth Proportional to 609.21, 840.69 and 343.65

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Solution

The fourth proportional to 609.21, 840.69 and 343.65 is: 474.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.21 : 840.69 = 343.65 : x
  2. Step 2: Convert to fraction form
    609.21/840.69 = 343.65/x
  3. Step 3: Cross multiply
    609.21x = 840.69 × 343.65
  4. Step 4: Simplify right side
    609.21x = 288,902.93
  5. Step 5: Solve for x
    x = 288,902.93/609.21
  6. Step 6: Final answer
    x = 474.22

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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.