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Finding the Fourth Proportional to 18,945.91, 28,399.90 and 15,624.41

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Solution

The fourth proportional to 18,945.91, 28,399.90 and 15,624.41 is: 23,420.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,945.91 : 28,399.90 = 15,624.41 : x
  2. Step 2: Convert to fraction form
    18,945.91/28,399.90 = 15,624.41/x
  3. Step 3: Cross multiply
    18,945.91x = 28,399.90 × 15,624.41
  4. Step 4: Simplify right side
    18,945.91x = 443,731,635.65
  5. Step 5: Solve for x
    x = 443,731,635.65/18,945.91
  6. Step 6: Final answer
    x = 23,420.97

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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.