Home / 20,913.20-28,858.68-11,479.88

Finding the Fourth Proportional to 20,913.20, 28,858.68 and 11,479.88

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Solution

The fourth proportional to 20,913.20, 28,858.68 and 11,479.88 is: 15,841.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,913.20 : 28,858.68 = 11,479.88 : x
  2. Step 2: Convert to fraction form
    20,913.20/28,858.68 = 11,479.88/x
  3. Step 3: Cross multiply
    20,913.20x = 28,858.68 × 11,479.88
  4. Step 4: Simplify right side
    20,913.20x = 331,294,183.36
  5. Step 5: Solve for x
    x = 331,294,183.36/20,913.20
  6. Step 6: Final answer
    x = 15,841.39

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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.