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Finding the Fourth Proportional to 1,361.03, 1,878.24 and 771.54

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Solution

The fourth proportional to 1,361.03, 1,878.24 and 771.54 is: 1,064.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.03 : 1,878.24 = 771.54 : x
  2. Step 2: Convert to fraction form
    1,361.03/1,878.24 = 771.54/x
  3. Step 3: Cross multiply
    1,361.03x = 1,878.24 × 771.54
  4. Step 4: Simplify right side
    1,361.03x = 1,449,137.29
  5. Step 5: Solve for x
    x = 1,449,137.29/1,361.03
  6. Step 6: Final answer
    x = 1,064.74

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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.