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Finding the Fourth Proportional to 1,291.07, 1,936.62 and 1,190.76

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Solution

The fourth proportional to 1,291.07, 1,936.62 and 1,190.76 is: 1,786.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.07 : 1,936.62 = 1,190.76 : x
  2. Step 2: Convert to fraction form
    1,291.07/1,936.62 = 1,190.76/x
  3. Step 3: Cross multiply
    1,291.07x = 1,936.62 × 1,190.76
  4. Step 4: Simplify right side
    1,291.07x = 2,306,049.63
  5. Step 5: Solve for x
    x = 2,306,049.63/1,291.07
  6. Step 6: Final answer
    x = 1,786.16

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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.