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Finding the Fourth Proportional to 116.72, 161.08 and 77.88

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Solution

The fourth proportional to 116.72, 161.08 and 77.88 is: 107.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.72 : 161.08 = 77.88 : x
  2. Step 2: Convert to fraction form
    116.72/161.08 = 77.88/x
  3. Step 3: Cross multiply
    116.72x = 161.08 × 77.88
  4. Step 4: Simplify right side
    116.72x = 12,544.91
  5. Step 5: Solve for x
    x = 12,544.91/116.72
  6. Step 6: Final answer
    x = 107.48

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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.