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Finding the Fourth Proportional to 660.78, 911.55 and 412.32

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Solution

The fourth proportional to 660.78, 911.55 and 412.32 is: 568.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.78 : 911.55 = 412.32 : x
  2. Step 2: Convert to fraction form
    660.78/911.55 = 412.32/x
  3. Step 3: Cross multiply
    660.78x = 911.55 × 412.32
  4. Step 4: Simplify right side
    660.78x = 375,850.30
  5. Step 5: Solve for x
    x = 375,850.30/660.78
  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.