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Finding the Fourth Proportional to 88.19, 121.69 and 55.38

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Solution

The fourth proportional to 88.19, 121.69 and 55.38 is: 76.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.19 : 121.69 = 55.38 : x
  2. Step 2: Convert to fraction form
    88.19/121.69 = 55.38/x
  3. Step 3: Cross multiply
    88.19x = 121.69 × 55.38
  4. Step 4: Simplify right side
    88.19x = 6,738.92
  5. Step 5: Solve for x
    x = 6,738.92/88.19
  6. Step 6: Final answer
    x = 76.42

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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.