Home / 12,390.12-17,107.06-8,090.54

Finding the Fourth Proportional to 12,390.12, 17,107.06 and 8,090.54

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Solution

The fourth proportional to 12,390.12, 17,107.06 and 8,090.54 is: 11,170.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.12 : 17,107.06 = 8,090.54 : x
  2. Step 2: Convert to fraction form
    12,390.12/17,107.06 = 8,090.54/x
  3. Step 3: Cross multiply
    12,390.12x = 17,107.06 × 8,090.54
  4. Step 4: Simplify right side
    12,390.12x = 138,405,353.21
  5. Step 5: Solve for x
    x = 138,405,353.21/12,390.12
  6. Step 6: Final answer
    x = 11,170.62

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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.