Home / 13,789.89-20,679.35-7,221.60

Finding the Fourth Proportional to 13,789.89, 20,679.35 and 7,221.60

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Solution

The fourth proportional to 13,789.89, 20,679.35 and 7,221.60 is: 10,829.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,789.89 : 20,679.35 = 7,221.60 : x
  2. Step 2: Convert to fraction form
    13,789.89/20,679.35 = 7,221.60/x
  3. Step 3: Cross multiply
    13,789.89x = 20,679.35 × 7,221.60
  4. Step 4: Simplify right side
    13,789.89x = 149,337,957.85
  5. Step 5: Solve for x
    x = 149,337,957.85/13,789.89
  6. Step 6: Final answer
    x = 10,829.52

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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.