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Finding the Fourth Proportional to 660.65, 911.70 and 361.90

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Solution

The fourth proportional to 660.65, 911.70 and 361.90 is: 499.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.65 : 911.70 = 361.90 : x
  2. Step 2: Convert to fraction form
    660.65/911.70 = 361.90/x
  3. Step 3: Cross multiply
    660.65x = 911.70 × 361.90
  4. Step 4: Simplify right side
    660.65x = 329,944.23
  5. Step 5: Solve for x
    x = 329,944.23/660.65
  6. Step 6: Final answer
    x = 499.42

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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.