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Finding the Fourth Proportional to 1,189.70, 1,641.39 and 691.94

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Solution

The fourth proportional to 1,189.70, 1,641.39 and 691.94 is: 954.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.70 : 1,641.39 = 691.94 : x
  2. Step 2: Convert to fraction form
    1,189.70/1,641.39 = 691.94/x
  3. Step 3: Cross multiply
    1,189.70x = 1,641.39 × 691.94
  4. Step 4: Simplify right side
    1,189.70x = 1,135,735.19
  5. Step 5: Solve for x
    x = 1,135,735.19/1,189.70
  6. Step 6: Final answer
    x = 954.64

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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.