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Finding the Fourth Proportional to 1,245.12, 1,863.63 and 755.88

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Solution

The fourth proportional to 1,245.12, 1,863.63 and 755.88 is: 1,131.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.12 : 1,863.63 = 755.88 : x
  2. Step 2: Convert to fraction form
    1,245.12/1,863.63 = 755.88/x
  3. Step 3: Cross multiply
    1,245.12x = 1,863.63 × 755.88
  4. Step 4: Simplify right side
    1,245.12x = 1,408,680.64
  5. Step 5: Solve for x
    x = 1,408,680.64/1,245.12
  6. Step 6: Final answer
    x = 1,131.36

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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.