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Finding the Fourth Proportional to 1,391.92, 2,087.91 and 1,025.60

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Solution

The fourth proportional to 1,391.92, 2,087.91 and 1,025.60 is: 1,538.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.92 : 2,087.91 = 1,025.60 : x
  2. Step 2: Convert to fraction form
    1,391.92/2,087.91 = 1,025.60/x
  3. Step 3: Cross multiply
    1,391.92x = 2,087.91 × 1,025.60
  4. Step 4: Simplify right side
    1,391.92x = 2,141,350.06
  5. Step 5: Solve for x
    x = 2,141,350.06/1,391.92
  6. Step 6: Final answer
    x = 1,538.42

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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.