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Finding the Fourth Proportional to 660.27, 911.48 and 394.83

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Solution

The fourth proportional to 660.27, 911.48 and 394.83 is: 545.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.27 : 911.48 = 394.83 : x
  2. Step 2: Convert to fraction form
    660.27/911.48 = 394.83/x
  3. Step 3: Cross multiply
    660.27x = 911.48 × 394.83
  4. Step 4: Simplify right side
    660.27x = 359,879.65
  5. Step 5: Solve for x
    x = 359,879.65/660.27
  6. Step 6: Final answer
    x = 545.05

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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.