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Finding the Fourth Proportional to 1,190.82, 1,644.09 and 817.68

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Solution

The fourth proportional to 1,190.82, 1,644.09 and 817.68 is: 1,128.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.82 : 1,644.09 = 817.68 : x
  2. Step 2: Convert to fraction form
    1,190.82/1,644.09 = 817.68/x
  3. Step 3: Cross multiply
    1,190.82x = 1,644.09 × 817.68
  4. Step 4: Simplify right side
    1,190.82x = 1,344,339.51
  5. Step 5: Solve for x
    x = 1,344,339.51/1,190.82
  6. Step 6: Final answer
    x = 1,128.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.