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Finding the Fourth Proportional to 1,638.62, 2,261.35 and 892.61

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Solution

The fourth proportional to 1,638.62, 2,261.35 and 892.61 is: 1,231.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.62 : 2,261.35 = 892.61 : x
  2. Step 2: Convert to fraction form
    1,638.62/2,261.35 = 892.61/x
  3. Step 3: Cross multiply
    1,638.62x = 2,261.35 × 892.61
  4. Step 4: Simplify right side
    1,638.62x = 2,018,493.43
  5. Step 5: Solve for x
    x = 2,018,493.43/1,638.62
  6. Step 6: Final answer
    x = 1,231.82

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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.