Home / 20,821.04-28,735.80-13,390.64

Finding the Fourth Proportional to 20,821.04, 28,735.80 and 13,390.64

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Solution

The fourth proportional to 20,821.04, 28,735.80 and 13,390.64 is: 18,480.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.04 : 28,735.80 = 13,390.64 : x
  2. Step 2: Convert to fraction form
    20,821.04/28,735.80 = 13,390.64/x
  3. Step 3: Cross multiply
    20,821.04x = 28,735.80 × 13,390.64
  4. Step 4: Simplify right side
    20,821.04x = 384,790,752.91
  5. Step 5: Solve for x
    x = 384,790,752.91/20,821.04
  6. Step 6: Final answer
    x = 18,480.86

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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.