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Finding the Fourth Proportional to 1,121.73, 1,685.24 and 1,059.57

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Solution

The fourth proportional to 1,121.73, 1,685.24 and 1,059.57 is: 1,591.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.73 : 1,685.24 = 1,059.57 : x
  2. Step 2: Convert to fraction form
    1,121.73/1,685.24 = 1,059.57/x
  3. Step 3: Cross multiply
    1,121.73x = 1,685.24 × 1,059.57
  4. Step 4: Simplify right side
    1,121.73x = 1,785,624.45
  5. Step 5: Solve for x
    x = 1,785,624.45/1,121.73
  6. Step 6: Final answer
    x = 1,591.85

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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.