Home / 20,917-28,865.66-11,485.77

Finding the Fourth Proportional to 20,917, 28,865.66 and 11,485.77

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Solution

The fourth proportional to 20,917, 28,865.66 and 11,485.77 is: 15,850.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917 : 28,865.66 = 11,485.77 : x
  2. Step 2: Convert to fraction form
    20,917/28,865.66 = 11,485.77/x
  3. Step 3: Cross multiply
    20,917x = 28,865.66 × 11,485.77
  4. Step 4: Simplify right side
    20,917x = 331,544,331.66
  5. Step 5: Solve for x
    x = 331,544,331.66/20,917
  6. Step 6: Final answer
    x = 15,850.47

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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.