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Finding the Fourth Proportional to 1,381.90, 1,907.23 and 822.42

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Solution

The fourth proportional to 1,381.90, 1,907.23 and 822.42 is: 1,135.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.90 : 1,907.23 = 822.42 : x
  2. Step 2: Convert to fraction form
    1,381.90/1,907.23 = 822.42/x
  3. Step 3: Cross multiply
    1,381.90x = 1,907.23 × 822.42
  4. Step 4: Simplify right side
    1,381.90x = 1,568,539.98
  5. Step 5: Solve for x
    x = 1,568,539.98/1,381.90
  6. Step 6: Final answer
    x = 1,135.06

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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.