Home / 9,090.82-12,540.90-6,439.60

Finding the Fourth Proportional to 9,090.82, 12,540.90 and 6,439.60

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Solution

The fourth proportional to 9,090.82, 12,540.90 and 6,439.60 is: 8,883.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,090.82 : 12,540.90 = 6,439.60 : x
  2. Step 2: Convert to fraction form
    9,090.82/12,540.90 = 6,439.60/x
  3. Step 3: Cross multiply
    9,090.82x = 12,540.90 × 6,439.60
  4. Step 4: Simplify right side
    9,090.82x = 80,758,379.64
  5. Step 5: Solve for x
    x = 80,758,379.64/9,090.82
  6. Step 6: Final answer
    x = 8,883.51

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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.