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Finding the Fourth Proportional to 13,745.80, 20,609.70 and 5,420.80

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Solution

The fourth proportional to 13,745.80, 20,609.70 and 5,420.80 is: 8,127.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,745.80 : 20,609.70 = 5,420.80 : x
  2. Step 2: Convert to fraction form
    13,745.80/20,609.70 = 5,420.80/x
  3. Step 3: Cross multiply
    13,745.80x = 20,609.70 × 5,420.80
  4. Step 4: Simplify right side
    13,745.80x = 111,721,061.76
  5. Step 5: Solve for x
    x = 111,721,061.76/13,745.80
  6. Step 6: Final answer
    x = 8,127.65

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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.