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Finding the Fourth Proportional to 18,930.53, 28,385.91 and 7,074.56

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Solution

The fourth proportional to 18,930.53, 28,385.91 and 7,074.56 is: 10,608.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,930.53 : 28,385.91 = 7,074.56 : x
  2. Step 2: Convert to fraction form
    18,930.53/28,385.91 = 7,074.56/x
  3. Step 3: Cross multiply
    18,930.53x = 28,385.91 × 7,074.56
  4. Step 4: Simplify right side
    18,930.53x = 200,817,681.52
  5. Step 5: Solve for x
    x = 200,817,681.52/18,930.53
  6. Step 6: Final answer
    x = 10,608.14

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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.