Home / 20,620.56-28,455.84-12,122.76

Finding the Fourth Proportional to 20,620.56, 28,455.84 and 12,122.76

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Solution

The fourth proportional to 20,620.56, 28,455.84 and 12,122.76 is: 16,729.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.56 : 28,455.84 = 12,122.76 : x
  2. Step 2: Convert to fraction form
    20,620.56/28,455.84 = 12,122.76/x
  3. Step 3: Cross multiply
    20,620.56x = 28,455.84 × 12,122.76
  4. Step 4: Simplify right side
    20,620.56x = 344,963,318.92
  5. Step 5: Solve for x
    x = 344,963,318.92/20,620.56
  6. Step 6: Final answer
    x = 16,729.10

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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.