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Finding the Fourth Proportional to 7,893.76, 11,840.64 and 3,999.28

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Solution

The fourth proportional to 7,893.76, 11,840.64 and 3,999.28 is: 5,998.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,893.76 : 11,840.64 = 3,999.28 : x
  2. Step 2: Convert to fraction form
    7,893.76/11,840.64 = 3,999.28/x
  3. Step 3: Cross multiply
    7,893.76x = 11,840.64 × 3,999.28
  4. Step 4: Simplify right side
    7,893.76x = 47,354,034.74
  5. Step 5: Solve for x
    x = 47,354,034.74/7,893.76
  6. Step 6: Final answer
    x = 5,998.92

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Similar ratio
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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.