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Finding the Fourth Proportional to 3,405.42, 5,107.50 and 939.92

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Solution

The fourth proportional to 3,405.42, 5,107.50 and 939.92 is: 1,409.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,405.42 : 5,107.50 = 939.92 : x
  2. Step 2: Convert to fraction form
    3,405.42/5,107.50 = 939.92/x
  3. Step 3: Cross multiply
    3,405.42x = 5,107.50 × 939.92
  4. Step 4: Simplify right side
    3,405.42x = 4,800,615.86
  5. Step 5: Solve for x
    x = 4,800,615.86/3,405.42
  6. Step 6: Final answer
    x = 1,409.70

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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.