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Finding the Fourth Proportional to 3,860.46, 5,790.72 and 938.79

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Solution

The fourth proportional to 3,860.46, 5,790.72 and 938.79 is: 1,408.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,860.46 : 5,790.72 = 938.79 : x
  2. Step 2: Convert to fraction form
    3,860.46/5,790.72 = 938.79/x
  3. Step 3: Cross multiply
    3,860.46x = 5,790.72 × 938.79
  4. Step 4: Simplify right side
    3,860.46x = 5,436,270.03
  5. Step 5: Solve for x
    x = 5,436,270.03/3,860.46
  6. Step 6: Final answer
    x = 1,408.19

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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.