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Finding the Fourth Proportional to 1,408.09, 1,941.34 and 965.20

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Solution

The fourth proportional to 1,408.09, 1,941.34 and 965.20 is: 1,330.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.09 : 1,941.34 = 965.20 : x
  2. Step 2: Convert to fraction form
    1,408.09/1,941.34 = 965.20/x
  3. Step 3: Cross multiply
    1,408.09x = 1,941.34 × 965.20
  4. Step 4: Simplify right side
    1,408.09x = 1,873,766.84
  5. Step 5: Solve for x
    x = 1,873,766.84/1,408.09
  6. Step 6: Final answer
    x = 1,330.72

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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.