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Finding the Fourth Proportional to 3,279.58, 4,918.76 and 939.09

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Solution

The fourth proportional to 3,279.58, 4,918.76 and 939.09 is: 1,408.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,279.58 : 4,918.76 = 939.09 : x
  2. Step 2: Convert to fraction form
    3,279.58/4,918.76 = 939.09/x
  3. Step 3: Cross multiply
    3,279.58x = 4,918.76 × 939.09
  4. Step 4: Simplify right side
    3,279.58x = 4,619,158.33
  5. Step 5: Solve for x
    x = 4,619,158.33/3,279.58
  6. Step 6: Final answer
    x = 1,408.46

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1.5x scale

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.