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Finding the Fourth Proportional to 88.24, 121.41 and 76.55

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Solution

The fourth proportional to 88.24, 121.41 and 76.55 is: 105.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.24 : 121.41 = 76.55 : x
  2. Step 2: Convert to fraction form
    88.24/121.41 = 76.55/x
  3. Step 3: Cross multiply
    88.24x = 121.41 × 76.55
  4. Step 4: Simplify right side
    88.24x = 9,293.94
  5. Step 5: Solve for x
    x = 9,293.94/88.24
  6. Step 6: Final answer
    x = 105.33

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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.