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Finding the Fourth Proportional to 1,361.64, 1,879.26 and 772.32

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Solution

The fourth proportional to 1,361.64, 1,879.26 and 772.32 is: 1,065.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.64 : 1,879.26 = 772.32 : x
  2. Step 2: Convert to fraction form
    1,361.64/1,879.26 = 772.32/x
  3. Step 3: Cross multiply
    1,361.64x = 1,879.26 × 772.32
  4. Step 4: Simplify right side
    1,361.64x = 1,451,390.08
  5. Step 5: Solve for x
    x = 1,451,390.08/1,361.64
  6. Step 6: Final answer
    x = 1,065.91

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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.