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Finding the Fourth Proportional to 18,759, 28,138.50 and 7,671.72

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Solution

The fourth proportional to 18,759, 28,138.50 and 7,671.72 is: 11,507.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,759 : 28,138.50 = 7,671.72 : x
  2. Step 2: Convert to fraction form
    18,759/28,138.50 = 7,671.72/x
  3. Step 3: Cross multiply
    18,759x = 28,138.50 × 7,671.72
  4. Step 4: Simplify right side
    18,759x = 215,870,693.22
  5. Step 5: Solve for x
    x = 215,870,693.22/18,759
  6. Step 6: Final answer
    x = 11,507.58

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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.