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Finding the Fourth Proportional to 18,012.21, 27,018.45 and 17,986.29

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Solution

The fourth proportional to 18,012.21, 27,018.45 and 17,986.29 is: 26,979.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,012.21 : 27,018.45 = 17,986.29 : x
  2. Step 2: Convert to fraction form
    18,012.21/27,018.45 = 17,986.29/x
  3. Step 3: Cross multiply
    18,012.21x = 27,018.45 × 17,986.29
  4. Step 4: Simplify right side
    18,012.21x = 485,961,677.05
  5. Step 5: Solve for x
    x = 485,961,677.05/18,012.21
  6. Step 6: Final answer
    x = 26,979.57

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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.