Home / 20,876.40-28,811.72-13,329.68

Finding the Fourth Proportional to 20,876.40, 28,811.72 and 13,329.68

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Solution

The fourth proportional to 20,876.40, 28,811.72 and 13,329.68 is: 18,396.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,876.40 : 28,811.72 = 13,329.68 : x
  2. Step 2: Convert to fraction form
    20,876.40/28,811.72 = 13,329.68/x
  3. Step 3: Cross multiply
    20,876.40x = 28,811.72 × 13,329.68
  4. Step 4: Simplify right side
    20,876.40x = 384,051,007.85
  5. Step 5: Solve for x
    x = 384,051,007.85/20,876.40
  6. Step 6: Final answer
    x = 18,396.42

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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.