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Finding the Fourth Proportional to 609.21, 840.81 and 347.22

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Solution

The fourth proportional to 609.21, 840.81 and 347.22 is: 479.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.21 : 840.81 = 347.22 : x
  2. Step 2: Convert to fraction form
    609.21/840.81 = 347.22/x
  3. Step 3: Cross multiply
    609.21x = 840.81 × 347.22
  4. Step 4: Simplify right side
    609.21x = 291,946.05
  5. Step 5: Solve for x
    x = 291,946.05/609.21
  6. Step 6: Final answer
    x = 479.22

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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.