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Finding the Fourth Proportional to 1,291.44, 1,936.14 and 641.82

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Solution

The fourth proportional to 1,291.44, 1,936.14 and 641.82 is: 962.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.44 : 1,936.14 = 641.82 : x
  2. Step 2: Convert to fraction form
    1,291.44/1,936.14 = 641.82/x
  3. Step 3: Cross multiply
    1,291.44x = 1,936.14 × 641.82
  4. Step 4: Simplify right side
    1,291.44x = 1,242,653.37
  5. Step 5: Solve for x
    x = 1,242,653.37/1,291.44
  6. Step 6: Final answer
    x = 962.22

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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.