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Finding the Fourth Proportional to 3,326.39, 4,990.65 and 986.41

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Solution

The fourth proportional to 3,326.39, 4,990.65 and 986.41 is: 1,479.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,326.39 : 4,990.65 = 986.41 : x
  2. Step 2: Convert to fraction form
    3,326.39/4,990.65 = 986.41/x
  3. Step 3: Cross multiply
    3,326.39x = 4,990.65 × 986.41
  4. Step 4: Simplify right side
    3,326.39x = 4,922,833.30
  5. Step 5: Solve for x
    x = 4,922,833.30/3,326.39
  6. Step 6: Final answer
    x = 1,479.93

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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.