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Finding the Fourth Proportional to 4,939.39, 7,408.31 and 1,820.89

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Solution

The fourth proportional to 4,939.39, 7,408.31 and 1,820.89 is: 2,731.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,939.39 : 7,408.31 = 1,820.89 : x
  2. Step 2: Convert to fraction form
    4,939.39/7,408.31 = 1,820.89/x
  3. Step 3: Cross multiply
    4,939.39x = 7,408.31 × 1,820.89
  4. Step 4: Simplify right side
    4,939.39x = 13,489,689.97
  5. Step 5: Solve for x
    x = 13,489,689.97/4,939.39
  6. Step 6: Final answer
    x = 2,731.05

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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.