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Finding the Fourth Proportional to 13,458.80, 20,188.20 and 11,817.20

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Solution

The fourth proportional to 13,458.80, 20,188.20 and 11,817.20 is: 17,725.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,458.80 : 20,188.20 = 11,817.20 : x
  2. Step 2: Convert to fraction form
    13,458.80/20,188.20 = 11,817.20/x
  3. Step 3: Cross multiply
    13,458.80x = 20,188.20 × 11,817.20
  4. Step 4: Simplify right side
    13,458.80x = 238,567,997.04
  5. Step 5: Solve for x
    x = 238,567,997.04/13,458.80
  6. Step 6: Final answer
    x = 17,725.80

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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.