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Finding the Fourth Proportional to 660.79, 911.89 and 366.09

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Solution

The fourth proportional to 660.79, 911.89 and 366.09 is: 505.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.79 : 911.89 = 366.09 : x
  2. Step 2: Convert to fraction form
    660.79/911.89 = 366.09/x
  3. Step 3: Cross multiply
    660.79x = 911.89 × 366.09
  4. Step 4: Simplify right side
    660.79x = 333,833.81
  5. Step 5: Solve for x
    x = 333,833.81/660.79
  6. Step 6: Final answer
    x = 505.20

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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.