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Finding the Fourth Proportional to 123.72, 170.64 and 94.11

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Solution

The fourth proportional to 123.72, 170.64 and 94.11 is: 129.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.72 : 170.64 = 94.11 : x
  2. Step 2: Convert to fraction form
    123.72/170.64 = 94.11/x
  3. Step 3: Cross multiply
    123.72x = 170.64 × 94.11
  4. Step 4: Simplify right side
    123.72x = 16,058.93
  5. Step 5: Solve for x
    x = 16,058.93/123.72
  6. Step 6: Final answer
    x = 129.80

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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.