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Finding the Fourth Proportional to 1,361.67, 1,879.08 and 772.31

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Solution

The fourth proportional to 1,361.67, 1,879.08 and 772.31 is: 1,065.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.67 : 1,879.08 = 772.31 : x
  2. Step 2: Convert to fraction form
    1,361.67/1,879.08 = 772.31/x
  3. Step 3: Cross multiply
    1,361.67x = 1,879.08 × 772.31
  4. Step 4: Simplify right side
    1,361.67x = 1,451,222.88
  5. Step 5: Solve for x
    x = 1,451,222.88/1,361.67
  6. Step 6: Final answer
    x = 1,065.77

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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.