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Finding the Fourth Proportional to 116.78, 161.22 and 77.99

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Solution

The fourth proportional to 116.78, 161.22 and 77.99 is: 107.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.78 : 161.22 = 77.99 : x
  2. Step 2: Convert to fraction form
    116.78/161.22 = 77.99/x
  3. Step 3: Cross multiply
    116.78x = 161.22 × 77.99
  4. Step 4: Simplify right side
    116.78x = 12,573.55
  5. Step 5: Solve for x
    x = 12,573.55/116.78
  6. Step 6: Final answer
    x = 107.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.