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Finding the Fourth Proportional to 1,137.92, 1,704.12 and 1,108.72

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Solution

The fourth proportional to 1,137.92, 1,704.12 and 1,108.72 is: 1,660.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.92 : 1,704.12 = 1,108.72 : x
  2. Step 2: Convert to fraction form
    1,137.92/1,704.12 = 1,108.72/x
  3. Step 3: Cross multiply
    1,137.92x = 1,704.12 × 1,108.72
  4. Step 4: Simplify right side
    1,137.92x = 1,889,391.93
  5. Step 5: Solve for x
    x = 1,889,391.93/1,137.92
  6. Step 6: Final answer
    x = 1,660.39

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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.