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Finding the Fourth Proportional to 116, 160.20 and 81.68

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Solution

The fourth proportional to 116, 160.20 and 81.68 is: 112.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    116 : 160.20 = 81.68 : x
  2. Step 2: Convert to fraction form
    116/160.20 = 81.68/x
  3. Step 3: Cross multiply
    116x = 160.20 × 81.68
  4. Step 4: Simplify right side
    116x = 13,085.14
  5. Step 5: Solve for x
    x = 13,085.14/116
  6. Step 6: Final answer
    x = 112.80

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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.