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Finding the Fourth Proportional to 660.65, 911.79 and 365.99

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Solution

The fourth proportional to 660.65, 911.79 and 365.99 is: 505.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.65 : 911.79 = 365.99 : x
  2. Step 2: Convert to fraction form
    660.65/911.79 = 365.99/x
  3. Step 3: Cross multiply
    660.65x = 911.79 × 365.99
  4. Step 4: Simplify right side
    660.65x = 333,706.02
  5. Step 5: Solve for x
    x = 333,706.02/660.65
  6. Step 6: Final answer
    x = 505.12

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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.