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Finding the Fourth Proportional to 3,907.15, 5,391.79 and 2,138.71

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Solution

The fourth proportional to 3,907.15, 5,391.79 and 2,138.71 is: 2,951.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,907.15 : 5,391.79 = 2,138.71 : x
  2. Step 2: Convert to fraction form
    3,907.15/5,391.79 = 2,138.71/x
  3. Step 3: Cross multiply
    3,907.15x = 5,391.79 × 2,138.71
  4. Step 4: Simplify right side
    3,907.15x = 11,531,475.19
  5. Step 5: Solve for x
    x = 11,531,475.19/3,907.15
  6. Step 6: Final answer
    x = 2,951.38

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1.5x scale

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.