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Finding the Fourth Proportional to 1,291.56, 1,936.22 and 641.96

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Solution

The fourth proportional to 1,291.56, 1,936.22 and 641.96 is: 962.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.56 : 1,936.22 = 641.96 : x
  2. Step 2: Convert to fraction form
    1,291.56/1,936.22 = 641.96/x
  3. Step 3: Cross multiply
    1,291.56x = 1,936.22 × 641.96
  4. Step 4: Simplify right side
    1,291.56x = 1,242,975.79
  5. Step 5: Solve for x
    x = 1,242,975.79/1,291.56
  6. Step 6: Final answer
    x = 962.38

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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.