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Finding the Fourth Proportional to 2,687.72, 4,032 and 838.46

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Solution

The fourth proportional to 2,687.72, 4,032 and 838.46 is: 1,257.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,687.72 : 4,032 = 838.46 : x
  2. Step 2: Convert to fraction form
    2,687.72/4,032 = 838.46/x
  3. Step 3: Cross multiply
    2,687.72x = 4,032 × 838.46
  4. Step 4: Simplify right side
    2,687.72x = 3,380,670.72
  5. Step 5: Solve for x
    x = 3,380,670.72/2,687.72
  6. Step 6: Final answer
    x = 1,257.82

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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.