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Finding the Fourth Proportional to 7,274.40, 10,912.80 and 3,990.24

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Solution

The fourth proportional to 7,274.40, 10,912.80 and 3,990.24 is: 5,986.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,274.40 : 10,912.80 = 3,990.24 : x
  2. Step 2: Convert to fraction form
    7,274.40/10,912.80 = 3,990.24/x
  3. Step 3: Cross multiply
    7,274.40x = 10,912.80 × 3,990.24
  4. Step 4: Simplify right side
    7,274.40x = 43,544,691.07
  5. Step 5: Solve for x
    x = 43,544,691.07/7,274.40
  6. Step 6: Final answer
    x = 5,986.02

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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.