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Finding the Fourth Proportional to 20,387.62, 30,584.48 and 7,238.89

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Solution

The fourth proportional to 20,387.62, 30,584.48 and 7,238.89 is: 10,859.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,387.62 : 30,584.48 = 7,238.89 : x
  2. Step 2: Convert to fraction form
    20,387.62/30,584.48 = 7,238.89/x
  3. Step 3: Cross multiply
    20,387.62x = 30,584.48 × 7,238.89
  4. Step 4: Simplify right side
    20,387.62x = 221,397,686.43
  5. Step 5: Solve for x
    x = 221,397,686.43/20,387.62
  6. Step 6: Final answer
    x = 10,859.42

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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.