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Finding the Fourth Proportional to 660.81, 911.90 and 366.09

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Solution

The fourth proportional to 660.81, 911.90 and 366.09 is: 505.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.81 : 911.90 = 366.09 : x
  2. Step 2: Convert to fraction form
    660.81/911.90 = 366.09/x
  3. Step 3: Cross multiply
    660.81x = 911.90 × 366.09
  4. Step 4: Simplify right side
    660.81x = 333,837.47
  5. Step 5: Solve for x
    x = 333,837.47/660.81
  6. Step 6: Final answer
    x = 505.19

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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.