Home / 20,579.45-28,399.83-11,148.21

Finding the Fourth Proportional to 20,579.45, 28,399.83 and 11,148.21

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Solution

The fourth proportional to 20,579.45, 28,399.83 and 11,148.21 is: 15,384.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,579.45 : 28,399.83 = 11,148.21 : x
  2. Step 2: Convert to fraction form
    20,579.45/28,399.83 = 11,148.21/x
  3. Step 3: Cross multiply
    20,579.45x = 28,399.83 × 11,148.21
  4. Step 4: Simplify right side
    20,579.45x = 316,607,268.80
  5. Step 5: Solve for x
    x = 316,607,268.80/20,579.45
  6. Step 6: Final answer
    x = 15,384.64

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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.