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Finding the Fourth Proportional to 18,775.56, 28,151.46 and 15,991.32

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Solution

The fourth proportional to 18,775.56, 28,151.46 and 15,991.32 is: 23,976.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,775.56 : 28,151.46 = 15,991.32 : x
  2. Step 2: Convert to fraction form
    18,775.56/28,151.46 = 15,991.32/x
  3. Step 3: Cross multiply
    18,775.56x = 28,151.46 × 15,991.32
  4. Step 4: Simplify right side
    18,775.56x = 450,179,005.33
  5. Step 5: Solve for x
    x = 450,179,005.33/18,775.56
  6. Step 6: Final answer
    x = 23,976.86

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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.