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Finding the Fourth Proportional to 106.11, 159.37 and 65.81

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Solution

The fourth proportional to 106.11, 159.37 and 65.81 is: 98.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.11 : 159.37 = 65.81 : x
  2. Step 2: Convert to fraction form
    106.11/159.37 = 65.81/x
  3. Step 3: Cross multiply
    106.11x = 159.37 × 65.81
  4. Step 4: Simplify right side
    106.11x = 10,488.37
  5. Step 5: Solve for x
    x = 10,488.37/106.11
  6. Step 6: Final answer
    x = 98.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.