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Finding the Fourth Proportional to 18,131.80, 27,165.30 and 15,539.80

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Solution

The fourth proportional to 18,131.80, 27,165.30 and 15,539.80 is: 23,281.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,131.80 : 27,165.30 = 15,539.80 : x
  2. Step 2: Convert to fraction form
    18,131.80/27,165.30 = 15,539.80/x
  3. Step 3: Cross multiply
    18,131.80x = 27,165.30 × 15,539.80
  4. Step 4: Simplify right side
    18,131.80x = 422,143,328.94
  5. Step 5: Solve for x
    x = 422,143,328.94/18,131.80
  6. Step 6: Final answer
    x = 23,281.93

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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.