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Finding the Fourth Proportional to 18,968.72, 28,456.14 and 7,123.41

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Solution

The fourth proportional to 18,968.72, 28,456.14 and 7,123.41 is: 10,686.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,968.72 : 28,456.14 = 7,123.41 : x
  2. Step 2: Convert to fraction form
    18,968.72/28,456.14 = 7,123.41/x
  3. Step 3: Cross multiply
    18,968.72x = 28,456.14 × 7,123.41
  4. Step 4: Simplify right side
    18,968.72x = 202,704,778.95
  5. Step 5: Solve for x
    x = 202,704,778.95/18,968.72
  6. Step 6: Final answer
    x = 10,686.27

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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.