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Finding the Fourth Proportional to 84.24, 115.23 and 83.88

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Solution

The fourth proportional to 84.24, 115.23 and 83.88 is: 114.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.24 : 115.23 = 83.88 : x
  2. Step 2: Convert to fraction form
    84.24/115.23 = 83.88/x
  3. Step 3: Cross multiply
    84.24x = 115.23 × 83.88
  4. Step 4: Simplify right side
    84.24x = 9,665.49
  5. Step 5: Solve for x
    x = 9,665.49/84.24
  6. Step 6: Final answer
    x = 114.74

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.