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Finding the Fourth Proportional to 939.38, 1,409.06 and 426.38

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Solution

The fourth proportional to 939.38, 1,409.06 and 426.38 is: 639.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.38 : 1,409.06 = 426.38 : x
  2. Step 2: Convert to fraction form
    939.38/1,409.06 = 426.38/x
  3. Step 3: Cross multiply
    939.38x = 1,409.06 × 426.38
  4. Step 4: Simplify right side
    939.38x = 600,789.02
  5. Step 5: Solve for x
    x = 600,789.02/939.38
  6. Step 6: Final answer
    x = 639.56

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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.