Home / 20,619.64-28,461.81-12,121.62

Finding the Fourth Proportional to 20,619.64, 28,461.81 and 12,121.62

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Solution

The fourth proportional to 20,619.64, 28,461.81 and 12,121.62 is: 16,731.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,619.64 : 28,461.81 = 12,121.62 : x
  2. Step 2: Convert to fraction form
    20,619.64/28,461.81 = 12,121.62/x
  3. Step 3: Cross multiply
    20,619.64x = 28,461.81 × 12,121.62
  4. Step 4: Simplify right side
    20,619.64x = 345,003,245.33
  5. Step 5: Solve for x
    x = 345,003,245.33/20,619.64
  6. Step 6: Final answer
    x = 16,731.78

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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.