Home / 20,817.90-28,728.81-11,257.77

Finding the Fourth Proportional to 20,817.90, 28,728.81 and 11,257.77

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Solution

The fourth proportional to 20,817.90, 28,728.81 and 11,257.77 is: 15,535.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,817.90 : 28,728.81 = 11,257.77 : x
  2. Step 2: Convert to fraction form
    20,817.90/28,728.81 = 11,257.77/x
  3. Step 3: Cross multiply
    20,817.90x = 28,728.81 × 11,257.77
  4. Step 4: Simplify right side
    20,817.90x = 323,422,335.35
  5. Step 5: Solve for x
    x = 323,422,335.35/20,817.90
  6. Step 6: Final answer
    x = 15,535.78

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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.