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Finding the Fourth Proportional to 106.11, 158.76 and 78.96

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Solution

The fourth proportional to 106.11, 158.76 and 78.96 is: 118.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.11 : 158.76 = 78.96 : x
  2. Step 2: Convert to fraction form
    106.11/158.76 = 78.96/x
  3. Step 3: Cross multiply
    106.11x = 158.76 × 78.96
  4. Step 4: Simplify right side
    106.11x = 12,535.69
  5. Step 5: Solve for x
    x = 12,535.69/106.11
  6. Step 6: Final answer
    x = 118.14

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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.