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Finding the Fourth Proportional to 1,261.82, 1,890.70 and 712.37

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Solution

The fourth proportional to 1,261.82, 1,890.70 and 712.37 is: 1,067.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.82 : 1,890.70 = 712.37 : x
  2. Step 2: Convert to fraction form
    1,261.82/1,890.70 = 712.37/x
  3. Step 3: Cross multiply
    1,261.82x = 1,890.70 × 712.37
  4. Step 4: Simplify right side
    1,261.82x = 1,346,877.96
  5. Step 5: Solve for x
    x = 1,346,877.96/1,261.82
  6. Step 6: Final answer
    x = 1,067.41

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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.