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Finding the Fourth Proportional to 88.74, 121.79 and 79.83

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Solution

The fourth proportional to 88.74, 121.79 and 79.83 is: 109.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.74 : 121.79 = 79.83 : x
  2. Step 2: Convert to fraction form
    88.74/121.79 = 79.83/x
  3. Step 3: Cross multiply
    88.74x = 121.79 × 79.83
  4. Step 4: Simplify right side
    88.74x = 9,722.70
  5. Step 5: Solve for x
    x = 9,722.70/88.74
  6. Step 6: Final answer
    x = 109.56

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.