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Finding the Fourth Proportional to 18,138.12, 27,208.20 and 4,990.20

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Solution

The fourth proportional to 18,138.12, 27,208.20 and 4,990.20 is: 7,485.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,138.12 : 27,208.20 = 4,990.20 : x
  2. Step 2: Convert to fraction form
    18,138.12/27,208.20 = 4,990.20/x
  3. Step 3: Cross multiply
    18,138.12x = 27,208.20 × 4,990.20
  4. Step 4: Simplify right side
    18,138.12x = 135,774,359.64
  5. Step 5: Solve for x
    x = 135,774,359.64/18,138.12
  6. Step 6: Final answer
    x = 7,485.58

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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.