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Finding the Fourth Proportional to 1,261.36, 1,890.38 and 644.54

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Solution

The fourth proportional to 1,261.36, 1,890.38 and 644.54 is: 965.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.36 : 1,890.38 = 644.54 : x
  2. Step 2: Convert to fraction form
    1,261.36/1,890.38 = 644.54/x
  3. Step 3: Cross multiply
    1,261.36x = 1,890.38 × 644.54
  4. Step 4: Simplify right side
    1,261.36x = 1,218,425.53
  5. Step 5: Solve for x
    x = 1,218,425.53/1,261.36
  6. Step 6: Final answer
    x = 965.96

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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.