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Finding the Fourth Proportional to 660.72, 911.61 and 381.04

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Solution

The fourth proportional to 660.72, 911.61 and 381.04 is: 525.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.72 : 911.61 = 381.04 : x
  2. Step 2: Convert to fraction form
    660.72/911.61 = 381.04/x
  3. Step 3: Cross multiply
    660.72x = 911.61 × 381.04
  4. Step 4: Simplify right side
    660.72x = 347,359.87
  5. Step 5: Solve for x
    x = 347,359.87/660.72
  6. Step 6: Final answer
    x = 525.73

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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.