Home / 12,085.78-18,129.91-4,188.28

Finding the Fourth Proportional to 12,085.78, 18,129.91 and 4,188.28

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Solution

The fourth proportional to 12,085.78, 18,129.91 and 4,188.28 is: 6,282.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,085.78 : 18,129.91 = 4,188.28 : x
  2. Step 2: Convert to fraction form
    12,085.78/18,129.91 = 4,188.28/x
  3. Step 3: Cross multiply
    12,085.78x = 18,129.91 × 4,188.28
  4. Step 4: Simplify right side
    12,085.78x = 75,933,139.45
  5. Step 5: Solve for x
    x = 75,933,139.45/12,085.78
  6. Step 6: Final answer
    x = 6,282.85

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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.