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Finding the Fourth Proportional to 13,439.60, 20,051.50 and 11,961.20

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Solution

The fourth proportional to 13,439.60, 20,051.50 and 11,961.20 is: 17,845.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,439.60 : 20,051.50 = 11,961.20 : x
  2. Step 2: Convert to fraction form
    13,439.60/20,051.50 = 11,961.20/x
  3. Step 3: Cross multiply
    13,439.60x = 20,051.50 × 11,961.20
  4. Step 4: Simplify right side
    13,439.60x = 239,840,001.80
  5. Step 5: Solve for x
    x = 239,840,001.80/13,439.60
  6. Step 6: Final answer
    x = 17,845.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.