Home / 20,821.89-28,734.21-11,261.78

Finding the Fourth Proportional to 20,821.89, 28,734.21 and 11,261.78

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Solution

The fourth proportional to 20,821.89, 28,734.21 and 11,261.78 is: 15,541.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.89 : 28,734.21 = 11,261.78 : x
  2. Step 2: Convert to fraction form
    20,821.89/28,734.21 = 11,261.78/x
  3. Step 3: Cross multiply
    20,821.89x = 28,734.21 × 11,261.78
  4. Step 4: Simplify right side
    20,821.89x = 323,598,351.49
  5. Step 5: Solve for x
    x = 323,598,351.49/20,821.89
  6. Step 6: Final answer
    x = 15,541.26

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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.