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Finding the Fourth Proportional to 609.32, 840.42 and 412.84

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Solution

The fourth proportional to 609.32, 840.42 and 412.84 is: 569.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.32 : 840.42 = 412.84 : x
  2. Step 2: Convert to fraction form
    609.32/840.42 = 412.84/x
  3. Step 3: Cross multiply
    609.32x = 840.42 × 412.84
  4. Step 4: Simplify right side
    609.32x = 346,958.99
  5. Step 5: Solve for x
    x = 346,958.99/609.32
  6. Step 6: Final answer
    x = 569.42

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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.