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Finding the Fourth Proportional to 13,638.89, 20,461.89 and 4,279.20

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Solution

The fourth proportional to 13,638.89, 20,461.89 and 4,279.20 is: 6,419.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,638.89 : 20,461.89 = 4,279.20 : x
  2. Step 2: Convert to fraction form
    13,638.89/20,461.89 = 4,279.20/x
  3. Step 3: Cross multiply
    13,638.89x = 20,461.89 × 4,279.20
  4. Step 4: Simplify right side
    13,638.89x = 87,560,519.69
  5. Step 5: Solve for x
    x = 87,560,519.69/13,638.89
  6. Step 6: Final answer
    x = 6,419.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.