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Finding the Fourth Proportional to 18,915.96, 28,375.82 and 7,239

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Solution

The fourth proportional to 18,915.96, 28,375.82 and 7,239 is: 10,859.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,915.96 : 28,375.82 = 7,239 : x
  2. Step 2: Convert to fraction form
    18,915.96/28,375.82 = 7,239/x
  3. Step 3: Cross multiply
    18,915.96x = 28,375.82 × 7,239
  4. Step 4: Simplify right side
    18,915.96x = 205,412,560.98
  5. Step 5: Solve for x
    x = 205,412,560.98/18,915.96
  6. Step 6: Final answer
    x = 10,859.22

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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.