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Finding the Fourth Proportional to 1,408.76, 2,109.90 and 791.54

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Solution

The fourth proportional to 1,408.76, 2,109.90 and 791.54 is: 1,185.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.76 : 2,109.90 = 791.54 : x
  2. Step 2: Convert to fraction form
    1,408.76/2,109.90 = 791.54/x
  3. Step 3: Cross multiply
    1,408.76x = 2,109.90 × 791.54
  4. Step 4: Simplify right side
    1,408.76x = 1,670,070.25
  5. Step 5: Solve for x
    x = 1,670,070.25/1,408.76
  6. Step 6: Final answer
    x = 1,185.49

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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.