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Finding the Fourth Proportional to 11,879.64, 17,825.60 and 5,220.81

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Solution

The fourth proportional to 11,879.64, 17,825.60 and 5,220.81 is: 7,833.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,879.64 : 17,825.60 = 5,220.81 : x
  2. Step 2: Convert to fraction form
    11,879.64/17,825.60 = 5,220.81/x
  3. Step 3: Cross multiply
    11,879.64x = 17,825.60 × 5,220.81
  4. Step 4: Simplify right side
    11,879.64x = 93,064,083.79
  5. Step 5: Solve for x
    x = 93,064,083.79/11,879.64
  6. Step 6: Final answer
    x = 7,833.91

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1.5x scale

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.