Home / 11,139.20-16,708.80-4,212.80

Finding the Fourth Proportional to 11,139.20, 16,708.80 and 4,212.80

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Solution

The fourth proportional to 11,139.20, 16,708.80 and 4,212.80 is: 6,319.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,139.20 : 16,708.80 = 4,212.80 : x
  2. Step 2: Convert to fraction form
    11,139.20/16,708.80 = 4,212.80/x
  3. Step 3: Cross multiply
    11,139.20x = 16,708.80 × 4,212.80
  4. Step 4: Simplify right side
    11,139.20x = 70,390,832.64
  5. Step 5: Solve for x
    x = 70,390,832.64/11,139.20
  6. Step 6: Final answer
    x = 6,319.20

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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.