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Finding the Fourth Proportional to 83.54, 115.23 and 66.05

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Solution

The fourth proportional to 83.54, 115.23 and 66.05 is: 91.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.54 : 115.23 = 66.05 : x
  2. Step 2: Convert to fraction form
    83.54/115.23 = 66.05/x
  3. Step 3: Cross multiply
    83.54x = 115.23 × 66.05
  4. Step 4: Simplify right side
    83.54x = 7,610.37
  5. Step 5: Solve for x
    x = 7,610.37/83.54
  6. Step 6: Final answer
    x = 91.10

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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.