Home / 12,305.42-18,459.21-3,985.64

Finding the Fourth Proportional to 12,305.42, 18,459.21 and 3,985.64

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Solution

The fourth proportional to 12,305.42, 18,459.21 and 3,985.64 is: 5,978.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,305.42 : 18,459.21 = 3,985.64 : x
  2. Step 2: Convert to fraction form
    12,305.42/18,459.21 = 3,985.64/x
  3. Step 3: Cross multiply
    12,305.42x = 18,459.21 × 3,985.64
  4. Step 4: Simplify right side
    12,305.42x = 73,571,765.74
  5. Step 5: Solve for x
    x = 73,571,765.74/12,305.42
  6. Step 6: Final answer
    x = 5,978.81

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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.