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Finding the Fourth Proportional to 3,139.06, 4,708.62 and 830.56

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Solution

The fourth proportional to 3,139.06, 4,708.62 and 830.56 is: 1,245.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.06 : 4,708.62 = 830.56 : x
  2. Step 2: Convert to fraction form
    3,139.06/4,708.62 = 830.56/x
  3. Step 3: Cross multiply
    3,139.06x = 4,708.62 × 830.56
  4. Step 4: Simplify right side
    3,139.06x = 3,910,791.43
  5. Step 5: Solve for x
    x = 3,910,791.43/3,139.06
  6. Step 6: Final answer
    x = 1,245.85

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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.