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Finding the Fourth Proportional to 3,907.39, 5,392.19 and 2,139

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Solution

The fourth proportional to 3,907.39, 5,392.19 and 2,139 is: 2,951.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,907.39 : 5,392.19 = 2,139 : x
  2. Step 2: Convert to fraction form
    3,907.39/5,392.19 = 2,139/x
  3. Step 3: Cross multiply
    3,907.39x = 5,392.19 × 2,139
  4. Step 4: Simplify right side
    3,907.39x = 11,533,894.41
  5. Step 5: Solve for x
    x = 11,533,894.41/3,907.39
  6. Step 6: Final answer
    x = 2,951.82

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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.