Home / 20,821.42-28,742.94-13,277.89

Finding the Fourth Proportional to 20,821.42, 28,742.94 and 13,277.89

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Solution

The fourth proportional to 20,821.42, 28,742.94 and 13,277.89 is: 18,329.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.42 : 28,742.94 = 13,277.89 : x
  2. Step 2: Convert to fraction form
    20,821.42/28,742.94 = 13,277.89/x
  3. Step 3: Cross multiply
    20,821.42x = 28,742.94 × 13,277.89
  4. Step 4: Simplify right side
    20,821.42x = 381,645,595.60
  5. Step 5: Solve for x
    x = 381,645,595.60/20,821.42
  6. Step 6: Final answer
    x = 18,329.47

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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.