Home / 20,390.96-28,137.26-11,436.60

Finding the Fourth Proportional to 20,390.96, 28,137.26 and 11,436.60

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Solution

The fourth proportional to 20,390.96, 28,137.26 and 11,436.60 is: 15,781.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.96 : 28,137.26 = 11,436.60 : x
  2. Step 2: Convert to fraction form
    20,390.96/28,137.26 = 11,436.60/x
  3. Step 3: Cross multiply
    20,390.96x = 28,137.26 × 11,436.60
  4. Step 4: Simplify right side
    20,390.96x = 321,794,587.72
  5. Step 5: Solve for x
    x = 321,794,587.72/20,390.96
  6. Step 6: Final answer
    x = 15,781.24

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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.