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Finding the Fourth Proportional to 7,999.60, 11,990.40 and 3,841.60

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Solution

The fourth proportional to 7,999.60, 11,990.40 and 3,841.60 is: 5,758.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,999.60 : 11,990.40 = 3,841.60 : x
  2. Step 2: Convert to fraction form
    7,999.60/11,990.40 = 3,841.60/x
  3. Step 3: Cross multiply
    7,999.60x = 11,990.40 × 3,841.60
  4. Step 4: Simplify right side
    7,999.60x = 46,062,320.64
  5. Step 5: Solve for x
    x = 46,062,320.64/7,999.60
  6. Step 6: Final answer
    x = 5,758.08

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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.