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Finding the Fourth Proportional to 7,999.95, 11,999.21 and 2,805.51

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Solution

The fourth proportional to 7,999.95, 11,999.21 and 2,805.51 is: 4,208.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,999.95 : 11,999.21 = 2,805.51 : x
  2. Step 2: Convert to fraction form
    7,999.95/11,999.21 = 2,805.51/x
  3. Step 3: Cross multiply
    7,999.95x = 11,999.21 × 2,805.51
  4. Step 4: Simplify right side
    7,999.95x = 33,663,889.62
  5. Step 5: Solve for x
    x = 33,663,889.62/7,999.95
  6. Step 6: Final answer
    x = 4,208.01

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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.