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Finding the Fourth Proportional to 11,920.37, 17,868.87 and 5,678.64

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Solution

The fourth proportional to 11,920.37, 17,868.87 and 5,678.64 is: 8,512.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,920.37 : 17,868.87 = 5,678.64 : x
  2. Step 2: Convert to fraction form
    11,920.37/17,868.87 = 5,678.64/x
  3. Step 3: Cross multiply
    11,920.37x = 17,868.87 × 5,678.64
  4. Step 4: Simplify right side
    11,920.37x = 101,470,879.94
  5. Step 5: Solve for x
    x = 101,470,879.94/11,920.37
  6. Step 6: Final answer
    x = 8,512.40

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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.