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Finding the Fourth Proportional to 609.35, 840.89 and 347.39

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Solution

The fourth proportional to 609.35, 840.89 and 347.39 is: 479.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.35 : 840.89 = 347.39 : x
  2. Step 2: Convert to fraction form
    609.35/840.89 = 347.39/x
  3. Step 3: Cross multiply
    609.35x = 840.89 × 347.39
  4. Step 4: Simplify right side
    609.35x = 292,115.04
  5. Step 5: Solve for x
    x = 292,115.04/609.35
  6. Step 6: Final answer
    x = 479.39

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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.