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Finding the Fourth Proportional to 3,999.60, 5,999.40 and 2,539.80

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Solution

The fourth proportional to 3,999.60, 5,999.40 and 2,539.80 is: 3,809.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,999.60 : 5,999.40 = 2,539.80 : x
  2. Step 2: Convert to fraction form
    3,999.60/5,999.40 = 2,539.80/x
  3. Step 3: Cross multiply
    3,999.60x = 5,999.40 × 2,539.80
  4. Step 4: Simplify right side
    3,999.60x = 15,237,276.12
  5. Step 5: Solve for x
    x = 15,237,276.12/3,999.60
  6. Step 6: Final answer
    x = 3,809.70

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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.