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Finding the Fourth Proportional to 13,658.40, 20,487.60 and 9,489.60

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Solution

The fourth proportional to 13,658.40, 20,487.60 and 9,489.60 is: 14,234.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,658.40 : 20,487.60 = 9,489.60 : x
  2. Step 2: Convert to fraction form
    13,658.40/20,487.60 = 9,489.60/x
  3. Step 3: Cross multiply
    13,658.40x = 20,487.60 × 9,489.60
  4. Step 4: Simplify right side
    13,658.40x = 194,419,128.96
  5. Step 5: Solve for x
    x = 194,419,128.96/13,658.40
  6. Step 6: Final answer
    x = 14,234.40

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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.