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Finding the Fourth Proportional to 1,381.63, 1,906.65 and 760.63

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Solution

The fourth proportional to 1,381.63, 1,906.65 and 760.63 is: 1,049.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.63 : 1,906.65 = 760.63 : x
  2. Step 2: Convert to fraction form
    1,381.63/1,906.65 = 760.63/x
  3. Step 3: Cross multiply
    1,381.63x = 1,906.65 × 760.63
  4. Step 4: Simplify right side
    1,381.63x = 1,450,241.85
  5. Step 5: Solve for x
    x = 1,450,241.85/1,381.63
  6. Step 6: Final answer
    x = 1,049.66

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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.