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Finding the Fourth Proportional to 1,289.70, 1,779.30 and 791.94

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Solution

The fourth proportional to 1,289.70, 1,779.30 and 791.94 is: 1,092.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.70 : 1,779.30 = 791.94 : x
  2. Step 2: Convert to fraction form
    1,289.70/1,779.30 = 791.94/x
  3. Step 3: Cross multiply
    1,289.70x = 1,779.30 × 791.94
  4. Step 4: Simplify right side
    1,289.70x = 1,409,098.84
  5. Step 5: Solve for x
    x = 1,409,098.84/1,289.70
  6. Step 6: Final answer
    x = 1,092.58

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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.