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Finding the Fourth Proportional to 88.21, 121.94 and 63.78

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Solution

The fourth proportional to 88.21, 121.94 and 63.78 is: 88.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.21 : 121.94 = 63.78 : x
  2. Step 2: Convert to fraction form
    88.21/121.94 = 63.78/x
  3. Step 3: Cross multiply
    88.21x = 121.94 × 63.78
  4. Step 4: Simplify right side
    88.21x = 7,777.33
  5. Step 5: Solve for x
    x = 7,777.33/88.21
  6. Step 6: Final answer
    x = 88.17

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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.