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Finding the Fourth Proportional to 3,903.84, 5,379.48 and 2,839.86

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Solution

The fourth proportional to 3,903.84, 5,379.48 and 2,839.86 is: 3,913.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,903.84 : 5,379.48 = 2,839.86 : x
  2. Step 2: Convert to fraction form
    3,903.84/5,379.48 = 2,839.86/x
  3. Step 3: Cross multiply
    3,903.84x = 5,379.48 × 2,839.86
  4. Step 4: Simplify right side
    3,903.84x = 15,276,970.07
  5. Step 5: Solve for x
    x = 15,276,970.07/3,903.84
  6. Step 6: Final answer
    x = 3,913.32

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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.