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Finding the Fourth Proportional to 3,827.76, 5,742.90 and 1,638.36

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Solution

The fourth proportional to 3,827.76, 5,742.90 and 1,638.36 is: 2,458.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,827.76 : 5,742.90 = 1,638.36 : x
  2. Step 2: Convert to fraction form
    3,827.76/5,742.90 = 1,638.36/x
  3. Step 3: Cross multiply
    3,827.76x = 5,742.90 × 1,638.36
  4. Step 4: Simplify right side
    3,827.76x = 9,408,937.64
  5. Step 5: Solve for x
    x = 9,408,937.64/3,827.76
  6. Step 6: Final answer
    x = 2,458.08

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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.