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Finding the Fourth Proportional to 18,879.72, 28,277.88 and 17,136.05

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Solution

The fourth proportional to 18,879.72, 28,277.88 and 17,136.05 is: 25,666.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.72 : 28,277.88 = 17,136.05 : x
  2. Step 2: Convert to fraction form
    18,879.72/28,277.88 = 17,136.05/x
  3. Step 3: Cross multiply
    18,879.72x = 28,277.88 × 17,136.05
  4. Step 4: Simplify right side
    18,879.72x = 484,571,024.18
  5. Step 5: Solve for x
    x = 484,571,024.18/18,879.72
  6. Step 6: Final answer
    x = 25,666.22

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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.