Home / 20,919.88-28,869.63-11,488.64

Finding the Fourth Proportional to 20,919.88, 28,869.63 and 11,488.64

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Solution

The fourth proportional to 20,919.88, 28,869.63 and 11,488.64 is: 15,854.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.88 : 28,869.63 = 11,488.64 : x
  2. Step 2: Convert to fraction form
    20,919.88/28,869.63 = 11,488.64/x
  3. Step 3: Cross multiply
    20,919.88x = 28,869.63 × 11,488.64
  4. Step 4: Simplify right side
    20,919.88x = 331,672,786.00
  5. Step 5: Solve for x
    x = 331,672,786.00/20,919.88
  6. Step 6: Final answer
    x = 15,854.43

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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.