Home / 20,621.24-28,450.76-12,120.64

Finding the Fourth Proportional to 20,621.24, 28,450.76 and 12,120.64

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Solution

The fourth proportional to 20,621.24, 28,450.76 and 12,120.64 is: 16,722.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,621.24 : 28,450.76 = 12,120.64 : x
  2. Step 2: Convert to fraction form
    20,621.24/28,450.76 = 12,120.64/x
  3. Step 3: Cross multiply
    20,621.24x = 28,450.76 × 12,120.64
  4. Step 4: Simplify right side
    20,621.24x = 344,841,419.69
  5. Step 5: Solve for x
    x = 344,841,419.69/20,621.24
  6. Step 6: Final answer
    x = 16,722.63

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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.