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Finding the Fourth Proportional to 1,185.99, 1,778.99 and 777.71

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Solution

The fourth proportional to 1,185.99, 1,778.99 and 777.71 is: 1,166.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.99 : 1,778.99 = 777.71 : x
  2. Step 2: Convert to fraction form
    1,185.99/1,778.99 = 777.71/x
  3. Step 3: Cross multiply
    1,185.99x = 1,778.99 × 777.71
  4. Step 4: Simplify right side
    1,185.99x = 1,383,538.31
  5. Step 5: Solve for x
    x = 1,383,538.31/1,185.99
  6. Step 6: Final answer
    x = 1,166.57

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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.