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Finding the Fourth Proportional to 1,361.74, 1,879.54 and 772.62

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Solution

The fourth proportional to 1,361.74, 1,879.54 and 772.62 is: 1,066.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.74 : 1,879.54 = 772.62 : x
  2. Step 2: Convert to fraction form
    1,361.74/1,879.54 = 772.62/x
  3. Step 3: Cross multiply
    1,361.74x = 1,879.54 × 772.62
  4. Step 4: Simplify right side
    1,361.74x = 1,452,170.19
  5. Step 5: Solve for x
    x = 1,452,170.19/1,361.74
  6. Step 6: Final answer
    x = 1,066.41

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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.