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Finding the Fourth Proportional to 94.12, 128.77 and 93.85

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Solution

The fourth proportional to 94.12, 128.77 and 93.85 is: 128.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.12 : 128.77 = 93.85 : x
  2. Step 2: Convert to fraction form
    94.12/128.77 = 93.85/x
  3. Step 3: Cross multiply
    94.12x = 128.77 × 93.85
  4. Step 4: Simplify right side
    94.12x = 12,084.60
  5. Step 5: Solve for x
    x = 12,084.60/94.12
  6. Step 6: Final answer
    x = 128.40

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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.