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Finding the Fourth Proportional to 116.78, 161.06 and 77.90

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Solution

The fourth proportional to 116.78, 161.06 and 77.90 is: 107.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.78 : 161.06 = 77.90 : x
  2. Step 2: Convert to fraction form
    116.78/161.06 = 77.90/x
  3. Step 3: Cross multiply
    116.78x = 161.06 × 77.90
  4. Step 4: Simplify right side
    116.78x = 12,546.57
  5. Step 5: Solve for x
    x = 12,546.57/116.78
  6. Step 6: Final answer
    x = 107.44

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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.