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Finding the Fourth Proportional to 2,147.81, 3,219.85 and 960.94

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Solution

The fourth proportional to 2,147.81, 3,219.85 and 960.94 is: 1,440.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,147.81 : 3,219.85 = 960.94 : x
  2. Step 2: Convert to fraction form
    2,147.81/3,219.85 = 960.94/x
  3. Step 3: Cross multiply
    2,147.81x = 3,219.85 × 960.94
  4. Step 4: Simplify right side
    2,147.81x = 3,094,077.01
  5. Step 5: Solve for x
    x = 3,094,077.01/2,147.81
  6. Step 6: Final answer
    x = 1,440.58

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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.