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Finding the Fourth Proportional to 1,141.92, 1,573.70 and 1,120.86

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Solution

The fourth proportional to 1,141.92, 1,573.70 and 1,120.86 is: 1,544.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,141.92 : 1,573.70 = 1,120.86 : x
  2. Step 2: Convert to fraction form
    1,141.92/1,573.70 = 1,120.86/x
  3. Step 3: Cross multiply
    1,141.92x = 1,573.70 × 1,120.86
  4. Step 4: Simplify right side
    1,141.92x = 1,763,891.78
  5. Step 5: Solve for x
    x = 1,763,891.78/1,141.92
  6. Step 6: Final answer
    x = 1,544.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.