Home / 20,619.36-28,455.30-12,122.06

Finding the Fourth Proportional to 20,619.36, 28,455.30 and 12,122.06

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Solution

The fourth proportional to 20,619.36, 28,455.30 and 12,122.06 is: 16,728.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,619.36 : 28,455.30 = 12,122.06 : x
  2. Step 2: Convert to fraction form
    20,619.36/28,455.30 = 12,122.06/x
  3. Step 3: Cross multiply
    20,619.36x = 28,455.30 × 12,122.06
  4. Step 4: Simplify right side
    20,619.36x = 344,936,711.64
  5. Step 5: Solve for x
    x = 344,936,711.64/20,619.36
  6. Step 6: Final answer
    x = 16,728.78

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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.