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Finding the Fourth Proportional to 11,989.54, 17,990.45 and 4,974.74

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Solution

The fourth proportional to 11,989.54, 17,990.45 and 4,974.74 is: 7,464.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,989.54 : 17,990.45 = 4,974.74 : x
  2. Step 2: Convert to fraction form
    11,989.54/17,990.45 = 4,974.74/x
  3. Step 3: Cross multiply
    11,989.54x = 17,990.45 × 4,974.74
  4. Step 4: Simplify right side
    11,989.54x = 89,497,811.23
  5. Step 5: Solve for x
    x = 89,497,811.23/11,989.54
  6. Step 6: Final answer
    x = 7,464.66

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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.