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Finding the Fourth Proportional to 1,405.89, 1,940.84 and 1,090.44

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Solution

The fourth proportional to 1,405.89, 1,940.84 and 1,090.44 is: 1,505.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.89 : 1,940.84 = 1,090.44 : x
  2. Step 2: Convert to fraction form
    1,405.89/1,940.84 = 1,090.44/x
  3. Step 3: Cross multiply
    1,405.89x = 1,940.84 × 1,090.44
  4. Step 4: Simplify right side
    1,405.89x = 2,116,364.12
  5. Step 5: Solve for x
    x = 2,116,364.12/1,405.89
  6. Step 6: Final answer
    x = 1,505.36

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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.