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Finding the Fourth Proportional to 116.78, 161 and 100.17

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Solution

The fourth proportional to 116.78, 161 and 100.17 is: 138.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.78 : 161 = 100.17 : x
  2. Step 2: Convert to fraction form
    116.78/161 = 100.17/x
  3. Step 3: Cross multiply
    116.78x = 161 × 100.17
  4. Step 4: Simplify right side
    116.78x = 16,127.37
  5. Step 5: Solve for x
    x = 16,127.37/116.78
  6. Step 6: Final answer
    x = 138.11

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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.