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Finding the Fourth Proportional to 2,939.76, 4,408.98 and 859.80

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Solution

The fourth proportional to 2,939.76, 4,408.98 and 859.80 is: 1,289.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,939.76 : 4,408.98 = 859.80 : x
  2. Step 2: Convert to fraction form
    2,939.76/4,408.98 = 859.80/x
  3. Step 3: Cross multiply
    2,939.76x = 4,408.98 × 859.80
  4. Step 4: Simplify right side
    2,939.76x = 3,790,841.00
  5. Step 5: Solve for x
    x = 3,790,841.00/2,939.76
  6. Step 6: Final answer
    x = 1,289.51

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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.