Home / 13,638.60-20,459.94-4,279.45

Finding the Fourth Proportional to 13,638.60, 20,459.94 and 4,279.45

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Solution

The fourth proportional to 13,638.60, 20,459.94 and 4,279.45 is: 6,419.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,638.60 : 20,459.94 = 4,279.45 : x
  2. Step 2: Convert to fraction form
    13,638.60/20,459.94 = 4,279.45/x
  3. Step 3: Cross multiply
    13,638.60x = 20,459.94 × 4,279.45
  4. Step 4: Simplify right side
    13,638.60x = 87,557,290.23
  5. Step 5: Solve for x
    x = 87,557,290.23/13,638.60
  6. Step 6: Final answer
    x = 6,419.82

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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.