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Finding the Fourth Proportional to 1,638.70, 2,261.41 and 892.64

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Solution

The fourth proportional to 1,638.70, 2,261.41 and 892.64 is: 1,231.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.70 : 2,261.41 = 892.64 : x
  2. Step 2: Convert to fraction form
    1,638.70/2,261.41 = 892.64/x
  3. Step 3: Cross multiply
    1,638.70x = 2,261.41 × 892.64
  4. Step 4: Simplify right side
    1,638.70x = 2,018,628.44
  5. Step 5: Solve for x
    x = 2,018,628.44/1,638.70
  6. Step 6: Final answer
    x = 1,231.85

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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.