Home / 12,345.20-18,519-3,579.92

Finding the Fourth Proportional to 12,345.20, 18,519 and 3,579.92

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Solution

The fourth proportional to 12,345.20, 18,519 and 3,579.92 is: 5,370.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,345.20 : 18,519 = 3,579.92 : x
  2. Step 2: Convert to fraction form
    12,345.20/18,519 = 3,579.92/x
  3. Step 3: Cross multiply
    12,345.20x = 18,519 × 3,579.92
  4. Step 4: Simplify right side
    12,345.20x = 66,296,538.48
  5. Step 5: Solve for x
    x = 66,296,538.48/12,345.20
  6. Step 6: Final answer
    x = 5,370.23

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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.