Home / 20,638.84-28,481.18-11,686.20

Finding the Fourth Proportional to 20,638.84, 28,481.18 and 11,686.20

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Solution

The fourth proportional to 20,638.84, 28,481.18 and 11,686.20 is: 16,126.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,638.84 : 28,481.18 = 11,686.20 : x
  2. Step 2: Convert to fraction form
    20,638.84/28,481.18 = 11,686.20/x
  3. Step 3: Cross multiply
    20,638.84x = 28,481.18 × 11,686.20
  4. Step 4: Simplify right side
    20,638.84x = 332,836,765.72
  5. Step 5: Solve for x
    x = 332,836,765.72/20,638.84
  6. Step 6: Final answer
    x = 16,126.72

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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.