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Finding the Fourth Proportional to 660.60, 911.46 and 411.90

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Solution

The fourth proportional to 660.60, 911.46 and 411.90 is: 568.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.60 : 911.46 = 411.90 : x
  2. Step 2: Convert to fraction form
    660.60/911.46 = 411.90/x
  3. Step 3: Cross multiply
    660.60x = 911.46 × 411.90
  4. Step 4: Simplify right side
    660.60x = 375,430.37
  5. Step 5: Solve for x
    x = 375,430.37/660.60
  6. Step 6: Final answer
    x = 568.32

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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.