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Finding the Fourth Proportional to 1,189.26, 1,640.91 and 691.64

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Solution

The fourth proportional to 1,189.26, 1,640.91 and 691.64 is: 954.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.26 : 1,640.91 = 691.64 : x
  2. Step 2: Convert to fraction form
    1,189.26/1,640.91 = 691.64/x
  3. Step 3: Cross multiply
    1,189.26x = 1,640.91 × 691.64
  4. Step 4: Simplify right side
    1,189.26x = 1,134,918.99
  5. Step 5: Solve for x
    x = 1,134,918.99/1,189.26
  6. Step 6: Final answer
    x = 954.31

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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.