Home / 20,994.80-31,489.76-8,520.39

Finding the Fourth Proportional to 20,994.80, 31,489.76 and 8,520.39

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Solution

The fourth proportional to 20,994.80, 31,489.76 and 8,520.39 is: 12,779.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,994.80 : 31,489.76 = 8,520.39 : x
  2. Step 2: Convert to fraction form
    20,994.80/31,489.76 = 8,520.39/x
  3. Step 3: Cross multiply
    20,994.80x = 31,489.76 × 8,520.39
  4. Step 4: Simplify right side
    20,994.80x = 268,305,057.51
  5. Step 5: Solve for x
    x = 268,305,057.51/20,994.80
  6. Step 6: Final answer
    x = 12,779.60

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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.