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Finding the Fourth Proportional to 989.46, 1,483.38 and 556.56

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Solution

The fourth proportional to 989.46, 1,483.38 and 556.56 is: 834.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.46 : 1,483.38 = 556.56 : x
  2. Step 2: Convert to fraction form
    989.46/1,483.38 = 556.56/x
  3. Step 3: Cross multiply
    989.46x = 1,483.38 × 556.56
  4. Step 4: Simplify right side
    989.46x = 825,589.97
  5. Step 5: Solve for x
    x = 825,589.97/989.46
  6. Step 6: Final answer
    x = 834.38

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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.