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Finding the Fourth Proportional to 609.12, 840.62 and 343.58

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Solution

The fourth proportional to 609.12, 840.62 and 343.58 is: 474.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.12 : 840.62 = 343.58 : x
  2. Step 2: Convert to fraction form
    609.12/840.62 = 343.58/x
  3. Step 3: Cross multiply
    609.12x = 840.62 × 343.58
  4. Step 4: Simplify right side
    609.12x = 288,820.22
  5. Step 5: Solve for x
    x = 288,820.22/609.12
  6. Step 6: Final answer
    x = 474.16

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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.