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Finding the Fourth Proportional to 107.93, 162.20 and 77.69

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Solution

The fourth proportional to 107.93, 162.20 and 77.69 is: 116.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.93 : 162.20 = 77.69 : x
  2. Step 2: Convert to fraction form
    107.93/162.20 = 77.69/x
  3. Step 3: Cross multiply
    107.93x = 162.20 × 77.69
  4. Step 4: Simplify right side
    107.93x = 12,601.92
  5. Step 5: Solve for x
    x = 12,601.92/107.93
  6. Step 6: Final answer
    x = 116.76

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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.