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Finding the Fourth Proportional to 660.42, 911.46 and 394.86

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Solution

The fourth proportional to 660.42, 911.46 and 394.86 is: 544.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.42 : 911.46 = 394.86 : x
  2. Step 2: Convert to fraction form
    660.42/911.46 = 394.86/x
  3. Step 3: Cross multiply
    660.42x = 911.46 × 394.86
  4. Step 4: Simplify right side
    660.42x = 359,899.10
  5. Step 5: Solve for x
    x = 359,899.10/660.42
  6. Step 6: Final answer
    x = 544.95

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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.