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Finding the Fourth Proportional to 1,137.34, 1,704.80 and 811.72

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Solution

The fourth proportional to 1,137.34, 1,704.80 and 811.72 is: 1,216.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.34 : 1,704.80 = 811.72 : x
  2. Step 2: Convert to fraction form
    1,137.34/1,704.80 = 811.72/x
  3. Step 3: Cross multiply
    1,137.34x = 1,704.80 × 811.72
  4. Step 4: Simplify right side
    1,137.34x = 1,383,819.85
  5. Step 5: Solve for x
    x = 1,383,819.85/1,137.34
  6. Step 6: Final answer
    x = 1,216.71

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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.