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Finding the Fourth Proportional to 2,469.78, 3,408.24 and 1,421.88

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Solution

The fourth proportional to 2,469.78, 3,408.24 and 1,421.88 is: 1,962.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,469.78 : 3,408.24 = 1,421.88 : x
  2. Step 2: Convert to fraction form
    2,469.78/3,408.24 = 1,421.88/x
  3. Step 3: Cross multiply
    2,469.78x = 3,408.24 × 1,421.88
  4. Step 4: Simplify right side
    2,469.78x = 4,846,108.29
  5. Step 5: Solve for x
    x = 4,846,108.29/2,469.78
  6. Step 6: Final answer
    x = 1,962.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.