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Finding the Fourth Proportional to 6,660.80, 9,991.20 and 3,539.60

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Solution

The fourth proportional to 6,660.80, 9,991.20 and 3,539.60 is: 5,309.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,660.80 : 9,991.20 = 3,539.60 : x
  2. Step 2: Convert to fraction form
    6,660.80/9,991.20 = 3,539.60/x
  3. Step 3: Cross multiply
    6,660.80x = 9,991.20 × 3,539.60
  4. Step 4: Simplify right side
    6,660.80x = 35,364,851.52
  5. Step 5: Solve for x
    x = 35,364,851.52/6,660.80
  6. Step 6: Final answer
    x = 5,309.40

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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.