Home / 21,779.22-30,057.78-12,221.70

Finding the Fourth Proportional to 21,779.22, 30,057.78 and 12,221.70

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Solution

The fourth proportional to 21,779.22, 30,057.78 and 12,221.70 is: 16,867.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,779.22 : 30,057.78 = 12,221.70 : x
  2. Step 2: Convert to fraction form
    21,779.22/30,057.78 = 12,221.70/x
  3. Step 3: Cross multiply
    21,779.22x = 30,057.78 × 12,221.70
  4. Step 4: Simplify right side
    21,779.22x = 367,357,169.83
  5. Step 5: Solve for x
    x = 367,357,169.83/21,779.22
  6. Step 6: Final answer
    x = 16,867.32

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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.