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Finding the Fourth Proportional to 2,939.60, 4,408.96 and 859.05

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Solution

The fourth proportional to 2,939.60, 4,408.96 and 859.05 is: 1,288.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,939.60 : 4,408.96 = 859.05 : x
  2. Step 2: Convert to fraction form
    2,939.60/4,408.96 = 859.05/x
  3. Step 3: Cross multiply
    2,939.60x = 4,408.96 × 859.05
  4. Step 4: Simplify right side
    2,939.60x = 3,787,517.09
  5. Step 5: Solve for x
    x = 3,787,517.09/2,939.60
  6. Step 6: Final answer
    x = 1,288.45

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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.