Home / 20,720.30-28,590.82-11,643.87

Finding the Fourth Proportional to 20,720.30, 28,590.82 and 11,643.87

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Solution

The fourth proportional to 20,720.30, 28,590.82 and 11,643.87 is: 16,066.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.30 : 28,590.82 = 11,643.87 : x
  2. Step 2: Convert to fraction form
    20,720.30/28,590.82 = 11,643.87/x
  3. Step 3: Cross multiply
    20,720.30x = 28,590.82 × 11,643.87
  4. Step 4: Simplify right side
    20,720.30x = 332,907,791.27
  5. Step 5: Solve for x
    x = 332,907,791.27/20,720.30
  6. Step 6: Final answer
    x = 16,066.75

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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.