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Finding the Fourth Proportional to 18,659.70, 27,989.55 and 5,512.20

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Solution

The fourth proportional to 18,659.70, 27,989.55 and 5,512.20 is: 8,268.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,659.70 : 27,989.55 = 5,512.20 : x
  2. Step 2: Convert to fraction form
    18,659.70/27,989.55 = 5,512.20/x
  3. Step 3: Cross multiply
    18,659.70x = 27,989.55 × 5,512.20
  4. Step 4: Simplify right side
    18,659.70x = 154,283,997.51
  5. Step 5: Solve for x
    x = 154,283,997.51/18,659.70
  6. Step 6: Final answer
    x = 8,268.30

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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.