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Finding the Fourth Proportional to 2,311.80, 3,468.42 and 668.40

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Solution

The fourth proportional to 2,311.80, 3,468.42 and 668.40 is: 1,002.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,311.80 : 3,468.42 = 668.40 : x
  2. Step 2: Convert to fraction form
    2,311.80/3,468.42 = 668.40/x
  3. Step 3: Cross multiply
    2,311.80x = 3,468.42 × 668.40
  4. Step 4: Simplify right side
    2,311.80x = 2,318,291.93
  5. Step 5: Solve for x
    x = 2,318,291.93/2,311.80
  6. Step 6: Final answer
    x = 1,002.81

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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.