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Finding the Fourth Proportional to 1,393.14, 2,090.07 and 699.78

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Solution

The fourth proportional to 1,393.14, 2,090.07 and 699.78 is: 1,049.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.14 : 2,090.07 = 699.78 : x
  2. Step 2: Convert to fraction form
    1,393.14/2,090.07 = 699.78/x
  3. Step 3: Cross multiply
    1,393.14x = 2,090.07 × 699.78
  4. Step 4: Simplify right side
    1,393.14x = 1,462,589.18
  5. Step 5: Solve for x
    x = 1,462,589.18/1,393.14
  6. Step 6: Final answer
    x = 1,049.85

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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.