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Finding the Fourth Proportional to 1,191, 1,786.86 and 643.08

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Solution

The fourth proportional to 1,191, 1,786.86 and 643.08 is: 964.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191 : 1,786.86 = 643.08 : x
  2. Step 2: Convert to fraction form
    1,191/1,786.86 = 643.08/x
  3. Step 3: Cross multiply
    1,191x = 1,786.86 × 643.08
  4. Step 4: Simplify right side
    1,191x = 1,149,093.93
  5. Step 5: Solve for x
    x = 1,149,093.93/1,191
  6. Step 6: Final answer
    x = 964.81

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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.