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Finding the Fourth Proportional to 939.27, 1,409.24 and 419.64

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Solution

The fourth proportional to 939.27, 1,409.24 and 419.64 is: 629.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.27 : 1,409.24 = 419.64 : x
  2. Step 2: Convert to fraction form
    939.27/1,409.24 = 419.64/x
  3. Step 3: Cross multiply
    939.27x = 1,409.24 × 419.64
  4. Step 4: Simplify right side
    939.27x = 591,371.38
  5. Step 5: Solve for x
    x = 591,371.38/939.27
  6. Step 6: Final answer
    x = 629.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.