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Finding the Fourth Proportional to 2,939.72, 4,409.99 and 859.88

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Solution

The fourth proportional to 2,939.72, 4,409.99 and 859.88 is: 1,289.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,939.72 : 4,409.99 = 859.88 : x
  2. Step 2: Convert to fraction form
    2,939.72/4,409.99 = 859.88/x
  3. Step 3: Cross multiply
    2,939.72x = 4,409.99 × 859.88
  4. Step 4: Simplify right side
    2,939.72x = 3,792,035.85
  5. Step 5: Solve for x
    x = 3,792,035.85/2,939.72
  6. Step 6: Final answer
    x = 1,289.93

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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.