Home / 13,211.89-18,240.29-8,739.48

Finding the Fourth Proportional to 13,211.89, 18,240.29 and 8,739.48

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Solution

The fourth proportional to 13,211.89, 18,240.29 and 8,739.48 is: 12,065.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,211.89 : 18,240.29 = 8,739.48 : x
  2. Step 2: Convert to fraction form
    13,211.89/18,240.29 = 8,739.48/x
  3. Step 3: Cross multiply
    13,211.89x = 18,240.29 × 8,739.48
  4. Step 4: Simplify right side
    13,211.89x = 159,410,514.75
  5. Step 5: Solve for x
    x = 159,410,514.75/13,211.89
  6. Step 6: Final answer
    x = 12,065.69

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1.5x scale

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.