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Finding the Fourth Proportional to 1,191.99, 1,786.50 and 919.11

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Solution

The fourth proportional to 1,191.99, 1,786.50 and 919.11 is: 1,377.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.99 : 1,786.50 = 919.11 : x
  2. Step 2: Convert to fraction form
    1,191.99/1,786.50 = 919.11/x
  3. Step 3: Cross multiply
    1,191.99x = 1,786.50 × 919.11
  4. Step 4: Simplify right side
    1,191.99x = 1,641,990.02
  5. Step 5: Solve for x
    x = 1,641,990.02/1,191.99
  6. Step 6: Final answer
    x = 1,377.52

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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.