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Finding the Fourth Proportional to 939.96, 1,409.94 and 255.96

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Solution

The fourth proportional to 939.96, 1,409.94 and 255.96 is: 383.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.96 : 1,409.94 = 255.96 : x
  2. Step 2: Convert to fraction form
    939.96/1,409.94 = 255.96/x
  3. Step 3: Cross multiply
    939.96x = 1,409.94 × 255.96
  4. Step 4: Simplify right side
    939.96x = 360,888.24
  5. Step 5: Solve for x
    x = 360,888.24/939.96
  6. Step 6: Final answer
    x = 383.94

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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.