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Finding the Fourth Proportional to 2,408.64, 3,611.88 and 764.88

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Solution

The fourth proportional to 2,408.64, 3,611.88 and 764.88 is: 1,146.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,408.64 : 3,611.88 = 764.88 : x
  2. Step 2: Convert to fraction form
    2,408.64/3,611.88 = 764.88/x
  3. Step 3: Cross multiply
    2,408.64x = 3,611.88 × 764.88
  4. Step 4: Simplify right side
    2,408.64x = 2,762,654.77
  5. Step 5: Solve for x
    x = 2,762,654.77/2,408.64
  6. Step 6: Final answer
    x = 1,146.98

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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.