Home / 12,579.12-17,359.68-6,990

Finding the Fourth Proportional to 12,579.12, 17,359.68 and 6,990

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Solution

The fourth proportional to 12,579.12, 17,359.68 and 6,990 is: 9,646.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,579.12 : 17,359.68 = 6,990 : x
  2. Step 2: Convert to fraction form
    12,579.12/17,359.68 = 6,990/x
  3. Step 3: Cross multiply
    12,579.12x = 17,359.68 × 6,990
  4. Step 4: Simplify right side
    12,579.12x = 121,344,163.20
  5. Step 5: Solve for x
    x = 121,344,163.20/12,579.12
  6. Step 6: Final answer
    x = 9,646.47

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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.