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Finding the Fourth Proportional to 18,765.65, 28,139.39 and 7,667.93

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Solution

The fourth proportional to 18,765.65, 28,139.39 and 7,667.93 is: 11,498.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,765.65 : 28,139.39 = 7,667.93 : x
  2. Step 2: Convert to fraction form
    18,765.65/28,139.39 = 7,667.93/x
  3. Step 3: Cross multiply
    18,765.65x = 28,139.39 × 7,667.93
  4. Step 4: Simplify right side
    18,765.65x = 215,770,834.42
  5. Step 5: Solve for x
    x = 215,770,834.42/18,765.65
  6. Step 6: Final answer
    x = 11,498.18

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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.