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Finding the Fourth Proportional to 88, 121.36 and 86.56

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Solution

The fourth proportional to 88, 121.36 and 86.56 is: 119.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    88 : 121.36 = 86.56 : x
  2. Step 2: Convert to fraction form
    88/121.36 = 86.56/x
  3. Step 3: Cross multiply
    88x = 121.36 × 86.56
  4. Step 4: Simplify right side
    88x = 10,504.92
  5. Step 5: Solve for x
    x = 10,504.92/88
  6. Step 6: Final answer
    x = 119.37

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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.