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Finding the Fourth Proportional to 3,326.70, 4,989.15 and 986.70

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Solution

The fourth proportional to 3,326.70, 4,989.15 and 986.70 is: 1,479.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,326.70 : 4,989.15 = 986.70 : x
  2. Step 2: Convert to fraction form
    3,326.70/4,989.15 = 986.70/x
  3. Step 3: Cross multiply
    3,326.70x = 4,989.15 × 986.70
  4. Step 4: Simplify right side
    3,326.70x = 4,922,794.31
  5. Step 5: Solve for x
    x = 4,922,794.31/3,326.70
  6. Step 6: Final answer
    x = 1,479.78

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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.