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Finding the Fourth Proportional to 661, 911.94 and 412.28

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Solution

The fourth proportional to 661, 911.94 and 412.28 is: 568.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    661 : 911.94 = 412.28 : x
  2. Step 2: Convert to fraction form
    661/911.94 = 412.28/x
  3. Step 3: Cross multiply
    661x = 911.94 × 412.28
  4. Step 4: Simplify right side
    661x = 375,974.62
  5. Step 5: Solve for x
    x = 375,974.62/661
  6. Step 6: Final answer
    x = 568.80

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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.