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Finding the Fourth Proportional to 18,872.54, 28,315.49 and 10,559.71

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Solution

The fourth proportional to 18,872.54, 28,315.49 and 10,559.71 is: 15,843.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,872.54 : 28,315.49 = 10,559.71 : x
  2. Step 2: Convert to fraction form
    18,872.54/28,315.49 = 10,559.71/x
  3. Step 3: Cross multiply
    18,872.54x = 28,315.49 × 10,559.71
  4. Step 4: Simplify right side
    18,872.54x = 299,003,239.32
  5. Step 5: Solve for x
    x = 299,003,239.32/18,872.54
  6. Step 6: Final answer
    x = 15,843.30

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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.