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Finding the Fourth Proportional to 123.80, 171.16 and 94.64

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Solution

The fourth proportional to 123.80, 171.16 and 94.64 is: 130.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.80 : 171.16 = 94.64 : x
  2. Step 2: Convert to fraction form
    123.80/171.16 = 94.64/x
  3. Step 3: Cross multiply
    123.80x = 171.16 × 94.64
  4. Step 4: Simplify right side
    123.80x = 16,198.58
  5. Step 5: Solve for x
    x = 16,198.58/123.80
  6. Step 6: Final answer
    x = 130.84

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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.