Home / 7,131.20-9,840.32-4,147.20

Finding the Fourth Proportional to 7,131.20, 9,840.32 and 4,147.20

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Solution

The fourth proportional to 7,131.20, 9,840.32 and 4,147.20 is: 5,722.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,131.20 : 9,840.32 = 4,147.20 : x
  2. Step 2: Convert to fraction form
    7,131.20/9,840.32 = 4,147.20/x
  3. Step 3: Cross multiply
    7,131.20x = 9,840.32 × 4,147.20
  4. Step 4: Simplify right side
    7,131.20x = 40,809,775.10
  5. Step 5: Solve for x
    x = 40,809,775.10/7,131.20
  6. Step 6: Final answer
    x = 5,722.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.