Home / 20,779.12-28,671.39-12,282.63

Finding the Fourth Proportional to 20,779.12, 28,671.39 and 12,282.63

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Solution

The fourth proportional to 20,779.12, 28,671.39 and 12,282.63 is: 16,947.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779.12 : 28,671.39 = 12,282.63 : x
  2. Step 2: Convert to fraction form
    20,779.12/28,671.39 = 12,282.63/x
  3. Step 3: Cross multiply
    20,779.12x = 28,671.39 × 12,282.63
  4. Step 4: Simplify right side
    20,779.12x = 352,160,074.96
  5. Step 5: Solve for x
    x = 352,160,074.96/20,779.12
  6. Step 6: Final answer
    x = 16,947.79

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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.