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Finding the Fourth Proportional to 3,278.94, 4,918.69 and 938.95

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Solution

The fourth proportional to 3,278.94, 4,918.69 and 938.95 is: 1,408.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,278.94 : 4,918.69 = 938.95 : x
  2. Step 2: Convert to fraction form
    3,278.94/4,918.69 = 938.95/x
  3. Step 3: Cross multiply
    3,278.94x = 4,918.69 × 938.95
  4. Step 4: Simplify right side
    3,278.94x = 4,618,403.98
  5. Step 5: Solve for x
    x = 4,618,403.98/3,278.94
  6. Step 6: Final answer
    x = 1,408.51

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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.