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Finding the Fourth Proportional to 13,659.79, 18,851.86 and 7,994.20

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Solution

The fourth proportional to 13,659.79, 18,851.86 and 7,994.20 is: 11,032.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,659.79 : 18,851.86 = 7,994.20 : x
  2. Step 2: Convert to fraction form
    13,659.79/18,851.86 = 7,994.20/x
  3. Step 3: Cross multiply
    13,659.79x = 18,851.86 × 7,994.20
  4. Step 4: Simplify right side
    13,659.79x = 150,705,439.43
  5. Step 5: Solve for x
    x = 150,705,439.43/13,659.79
  6. Step 6: Final answer
    x = 11,032.78

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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.