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Finding the Fourth Proportional to 939.33, 1,409.06 and 419.09

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Solution

The fourth proportional to 939.33, 1,409.06 and 419.09 is: 628.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.33 : 1,409.06 = 419.09 : x
  2. Step 2: Convert to fraction form
    939.33/1,409.06 = 419.09/x
  3. Step 3: Cross multiply
    939.33x = 1,409.06 × 419.09
  4. Step 4: Simplify right side
    939.33x = 590,516.96
  5. Step 5: Solve for x
    x = 590,516.96/939.33
  6. Step 6: Final answer
    x = 628.66

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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.