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Finding the Fourth Proportional to 1,174.90, 1,620.82 and 825.79

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Solution

The fourth proportional to 1,174.90, 1,620.82 and 825.79 is: 1,139.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,174.90 : 1,620.82 = 825.79 : x
  2. Step 2: Convert to fraction form
    1,174.90/1,620.82 = 825.79/x
  3. Step 3: Cross multiply
    1,174.90x = 1,620.82 × 825.79
  4. Step 4: Simplify right side
    1,174.90x = 1,338,450.83
  5. Step 5: Solve for x
    x = 1,338,450.83/1,174.90
  6. Step 6: Final answer
    x = 1,139.21

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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.