Home / 20,911.74-28,858.59-11,480.64

Finding the Fourth Proportional to 20,911.74, 28,858.59 and 11,480.64

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Solution

The fourth proportional to 20,911.74, 28,858.59 and 11,480.64 is: 15,843.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911.74 : 28,858.59 = 11,480.64 : x
  2. Step 2: Convert to fraction form
    20,911.74/28,858.59 = 11,480.64/x
  3. Step 3: Cross multiply
    20,911.74x = 28,858.59 × 11,480.64
  4. Step 4: Simplify right side
    20,911.74x = 331,315,082.70
  5. Step 5: Solve for x
    x = 331,315,082.70/20,911.74
  6. Step 6: Final answer
    x = 15,843.50

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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.