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Finding the Fourth Proportional to 7,647.20, 11,449.20 and 7,431.20

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Solution

The fourth proportional to 7,647.20, 11,449.20 and 7,431.20 is: 11,125.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,647.20 : 11,449.20 = 7,431.20 : x
  2. Step 2: Convert to fraction form
    7,647.20/11,449.20 = 7,431.20/x
  3. Step 3: Cross multiply
    7,647.20x = 11,449.20 × 7,431.20
  4. Step 4: Simplify right side
    7,647.20x = 85,081,295.04
  5. Step 5: Solve for x
    x = 85,081,295.04/7,647.20
  6. Step 6: Final answer
    x = 11,125.81

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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.