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Finding the Fourth Proportional to 18,015.90, 27,009.45 and 7,619.10

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Solution

The fourth proportional to 18,015.90, 27,009.45 and 7,619.10 is: 11,422.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,015.90 : 27,009.45 = 7,619.10 : x
  2. Step 2: Convert to fraction form
    18,015.90/27,009.45 = 7,619.10/x
  3. Step 3: Cross multiply
    18,015.90x = 27,009.45 × 7,619.10
  4. Step 4: Simplify right side
    18,015.90x = 205,787,700.50
  5. Step 5: Solve for x
    x = 205,787,700.50/18,015.90
  6. Step 6: Final answer
    x = 11,422.56

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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.