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Finding the Fourth Proportional to 7,486.40, 11,236.40 and 3,791.20

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Solution

The fourth proportional to 7,486.40, 11,236.40 and 3,791.20 is: 5,690.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,486.40 : 11,236.40 = 3,791.20 : x
  2. Step 2: Convert to fraction form
    7,486.40/11,236.40 = 3,791.20/x
  3. Step 3: Cross multiply
    7,486.40x = 11,236.40 × 3,791.20
  4. Step 4: Simplify right side
    7,486.40x = 42,599,439.68
  5. Step 5: Solve for x
    x = 42,599,439.68/7,486.40
  6. Step 6: Final answer
    x = 5,690.24

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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.