Home / 7,679.20-11,518.80-2,485.60

Finding the Fourth Proportional to 7,679.20, 11,518.80 and 2,485.60

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Solution

The fourth proportional to 7,679.20, 11,518.80 and 2,485.60 is: 3,728.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,679.20 : 11,518.80 = 2,485.60 : x
  2. Step 2: Convert to fraction form
    7,679.20/11,518.80 = 2,485.60/x
  3. Step 3: Cross multiply
    7,679.20x = 11,518.80 × 2,485.60
  4. Step 4: Simplify right side
    7,679.20x = 28,631,129.28
  5. Step 5: Solve for x
    x = 28,631,129.28/7,679.20
  6. Step 6: Final answer
    x = 3,728.40

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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.