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Finding the Fourth Proportional to 2,939.13, 4,408.21 and 858.64

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Solution

The fourth proportional to 2,939.13, 4,408.21 and 858.64 is: 1,287.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,939.13 : 4,408.21 = 858.64 : x
  2. Step 2: Convert to fraction form
    2,939.13/4,408.21 = 858.64/x
  3. Step 3: Cross multiply
    2,939.13x = 4,408.21 × 858.64
  4. Step 4: Simplify right side
    2,939.13x = 3,785,065.43
  5. Step 5: Solve for x
    x = 3,785,065.43/2,939.13
  6. Step 6: Final answer
    x = 1,287.82

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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.