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Finding the Fourth Proportional to 88.49, 122.21 and 83.38

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Solution

The fourth proportional to 88.49, 122.21 and 83.38 is: 115.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.49 : 122.21 = 83.38 : x
  2. Step 2: Convert to fraction form
    88.49/122.21 = 83.38/x
  3. Step 3: Cross multiply
    88.49x = 122.21 × 83.38
  4. Step 4: Simplify right side
    88.49x = 10,189.69
  5. Step 5: Solve for x
    x = 10,189.69/88.49
  6. Step 6: Final answer
    x = 115.15

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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.