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Finding the Fourth Proportional to 1,361.60, 1,879.02 and 772.18

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Solution

The fourth proportional to 1,361.60, 1,879.02 and 772.18 is: 1,065.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.60 : 1,879.02 = 772.18 : x
  2. Step 2: Convert to fraction form
    1,361.60/1,879.02 = 772.18/x
  3. Step 3: Cross multiply
    1,361.60x = 1,879.02 × 772.18
  4. Step 4: Simplify right side
    1,361.60x = 1,450,928.41
  5. Step 5: Solve for x
    x = 1,450,928.41/1,361.60
  6. Step 6: Final answer
    x = 1,065.61

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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.