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Finding the Fourth Proportional to 1,261.75, 1,893.11 and 492.31

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Solution

The fourth proportional to 1,261.75, 1,893.11 and 492.31 is: 738.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.75 : 1,893.11 = 492.31 : x
  2. Step 2: Convert to fraction form
    1,261.75/1,893.11 = 492.31/x
  3. Step 3: Cross multiply
    1,261.75x = 1,893.11 × 492.31
  4. Step 4: Simplify right side
    1,261.75x = 931,996.98
  5. Step 5: Solve for x
    x = 931,996.98/1,261.75
  6. Step 6: Final answer
    x = 738.65

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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.