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Finding the Fourth Proportional to 1,361.12, 2,037.99 and 891.42

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Solution

The fourth proportional to 1,361.12, 2,037.99 and 891.42 is: 1,334.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.12 : 2,037.99 = 891.42 : x
  2. Step 2: Convert to fraction form
    1,361.12/2,037.99 = 891.42/x
  3. Step 3: Cross multiply
    1,361.12x = 2,037.99 × 891.42
  4. Step 4: Simplify right side
    1,361.12x = 1,816,705.05
  5. Step 5: Solve for x
    x = 1,816,705.05/1,361.12
  6. Step 6: Final answer
    x = 1,334.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.