Home / 20,742.89-31,119.80-10,879.52

Finding the Fourth Proportional to 20,742.89, 31,119.80 and 10,879.52

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Solution

The fourth proportional to 20,742.89, 31,119.80 and 10,879.52 is: 16,322.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,742.89 : 31,119.80 = 10,879.52 : x
  2. Step 2: Convert to fraction form
    20,742.89/31,119.80 = 10,879.52/x
  3. Step 3: Cross multiply
    20,742.89x = 31,119.80 × 10,879.52
  4. Step 4: Simplify right side
    20,742.89x = 338,568,276.50
  5. Step 5: Solve for x
    x = 338,568,276.50/20,742.89
  6. Step 6: Final answer
    x = 16,322.14

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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.