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Finding the Fourth Proportional to 1,261.41, 1,891.67 and 481.63

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Solution

The fourth proportional to 1,261.41, 1,891.67 and 481.63 is: 722.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.41 : 1,891.67 = 481.63 : x
  2. Step 2: Convert to fraction form
    1,261.41/1,891.67 = 481.63/x
  3. Step 3: Cross multiply
    1,261.41x = 1,891.67 × 481.63
  4. Step 4: Simplify right side
    1,261.41x = 911,084.92
  5. Step 5: Solve for x
    x = 911,084.92/1,261.41
  6. Step 6: Final answer
    x = 722.28

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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.