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Finding the Fourth Proportional to 939.50, 1,409.26 and 255.50

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Solution

The fourth proportional to 939.50, 1,409.26 and 255.50 is: 383.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.50 : 1,409.26 = 255.50 : x
  2. Step 2: Convert to fraction form
    939.50/1,409.26 = 255.50/x
  3. Step 3: Cross multiply
    939.50x = 1,409.26 × 255.50
  4. Step 4: Simplify right side
    939.50x = 360,065.93
  5. Step 5: Solve for x
    x = 360,065.93/939.50
  6. Step 6: Final answer
    x = 383.25

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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.