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Finding the Fourth Proportional to 13,862.40, 20,793.60 and 11,961.60

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Solution

The fourth proportional to 13,862.40, 20,793.60 and 11,961.60 is: 17,942.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,862.40 : 20,793.60 = 11,961.60 : x
  2. Step 2: Convert to fraction form
    13,862.40/20,793.60 = 11,961.60/x
  3. Step 3: Cross multiply
    13,862.40x = 20,793.60 × 11,961.60
  4. Step 4: Simplify right side
    13,862.40x = 248,724,725.76
  5. Step 5: Solve for x
    x = 248,724,725.76/13,862.40
  6. Step 6: Final answer
    x = 17,942.40

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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.