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Finding the Fourth Proportional to 20,115, 30,176.82 and 7,803

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Solution

The fourth proportional to 20,115, 30,176.82 and 7,803 is: 11,706.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,115 : 30,176.82 = 7,803 : x
  2. Step 2: Convert to fraction form
    20,115/30,176.82 = 7,803/x
  3. Step 3: Cross multiply
    20,115x = 30,176.82 × 7,803
  4. Step 4: Simplify right side
    20,115x = 235,469,726.46
  5. Step 5: Solve for x
    x = 235,469,726.46/20,115
  6. Step 6: Final answer
    x = 11,706.18

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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.