Home / 20,917.13-28,865.84-11,485.89

Finding the Fourth Proportional to 20,917.13, 28,865.84 and 11,485.89

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Solution

The fourth proportional to 20,917.13, 28,865.84 and 11,485.89 is: 15,850.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.13 : 28,865.84 = 11,485.89 : x
  2. Step 2: Convert to fraction form
    20,917.13/28,865.84 = 11,485.89/x
  3. Step 3: Cross multiply
    20,917.13x = 28,865.84 × 11,485.89
  4. Step 4: Simplify right side
    20,917.13x = 331,549,805.57
  5. Step 5: Solve for x
    x = 331,549,805.57/20,917.13
  6. Step 6: Final answer
    x = 15,850.64

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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.