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Finding the Fourth Proportional to 18,745.40, 28,128.90 and 7,059.80

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Solution

The fourth proportional to 18,745.40, 28,128.90 and 7,059.80 is: 10,593.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,745.40 : 28,128.90 = 7,059.80 : x
  2. Step 2: Convert to fraction form
    18,745.40/28,128.90 = 7,059.80/x
  3. Step 3: Cross multiply
    18,745.40x = 28,128.90 × 7,059.80
  4. Step 4: Simplify right side
    18,745.40x = 198,584,408.22
  5. Step 5: Solve for x
    x = 198,584,408.22/18,745.40
  6. Step 6: Final answer
    x = 10,593.77

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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.