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Finding the Fourth Proportional to 18,015.80, 26,991.30 and 15,423.80

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Solution

The fourth proportional to 18,015.80, 26,991.30 and 15,423.80 is: 23,107.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,015.80 : 26,991.30 = 15,423.80 : x
  2. Step 2: Convert to fraction form
    18,015.80/26,991.30 = 15,423.80/x
  3. Step 3: Cross multiply
    18,015.80x = 26,991.30 × 15,423.80
  4. Step 4: Simplify right side
    18,015.80x = 416,308,412.94
  5. Step 5: Solve for x
    x = 416,308,412.94/18,015.80
  6. Step 6: Final answer
    x = 23,107.96

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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.