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Finding the Fourth Proportional to 221,096.69, 331,715.11 and 78,938.85

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Solution

The fourth proportional to 221,096.69, 331,715.11 and 78,938.85 is: 118,433.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,096.69 : 331,715.11 = 78,938.85 : x
  2. Step 2: Convert to fraction form
    221,096.69/331,715.11 = 78,938.85/x
  3. Step 3: Cross multiply
    221,096.69x = 331,715.11 × 78,938.85
  4. Step 4: Simplify right side
    221,096.69x = 26,185,209,311.02
  5. Step 5: Solve for x
    x = 26,185,209,311.02/221,096.69
  6. Step 6: Final answer
    x = 118,433.29

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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.