Home / 12,078.88-18,120.76-4,288.30

Finding the Fourth Proportional to 12,078.88, 18,120.76 and 4,288.30

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Solution

The fourth proportional to 12,078.88, 18,120.76 and 4,288.30 is: 6,433.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,078.88 : 18,120.76 = 4,288.30 : x
  2. Step 2: Convert to fraction form
    12,078.88/18,120.76 = 4,288.30/x
  3. Step 3: Cross multiply
    12,078.88x = 18,120.76 × 4,288.30
  4. Step 4: Simplify right side
    12,078.88x = 77,707,255.11
  5. Step 5: Solve for x
    x = 77,707,255.11/12,078.88
  6. Step 6: Final answer
    x = 6,433.32

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1.5x scale

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.