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Finding the Fourth Proportional to 20,462.80, 28,243.20 and 13,385.20

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Solution

The fourth proportional to 20,462.80, 28,243.20 and 13,385.20 is: 18,474.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,462.80 : 28,243.20 = 13,385.20 : x
  2. Step 2: Convert to fraction form
    20,462.80/28,243.20 = 13,385.20/x
  3. Step 3: Cross multiply
    20,462.80x = 28,243.20 × 13,385.20
  4. Step 4: Simplify right side
    20,462.80x = 378,040,880.64
  5. Step 5: Solve for x
    x = 378,040,880.64/20,462.80
  6. Step 6: Final answer
    x = 18,474.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.