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Finding the Fourth Proportional to 3,329.21, 4,994.81 and 989.29

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Solution

The fourth proportional to 3,329.21, 4,994.81 and 989.29 is: 1,484.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,329.21 : 4,994.81 = 989.29 : x
  2. Step 2: Convert to fraction form
    3,329.21/4,994.81 = 989.29/x
  3. Step 3: Cross multiply
    3,329.21x = 4,994.81 × 989.29
  4. Step 4: Simplify right side
    3,329.21x = 4,941,315.58
  5. Step 5: Solve for x
    x = 4,941,315.58/3,329.21
  6. Step 6: Final answer
    x = 1,484.23

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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.