Home / 20,578.75-28,398.68-11,147.32

Finding the Fourth Proportional to 20,578.75, 28,398.68 and 11,147.32

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Solution

The fourth proportional to 20,578.75, 28,398.68 and 11,147.32 is: 15,383.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,578.75 : 28,398.68 = 11,147.32 : x
  2. Step 2: Convert to fraction form
    20,578.75/28,398.68 = 11,147.32/x
  3. Step 3: Cross multiply
    20,578.75x = 28,398.68 × 11,147.32
  4. Step 4: Simplify right side
    20,578.75x = 316,569,173.54
  5. Step 5: Solve for x
    x = 316,569,173.54/20,578.75
  6. Step 6: Final answer
    x = 15,383.30

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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.