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Finding the Fourth Proportional to 94.20, 128.82 and 93.66

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Solution

The fourth proportional to 94.20, 128.82 and 93.66 is: 128.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.20 : 128.82 = 93.66 : x
  2. Step 2: Convert to fraction form
    94.20/128.82 = 93.66/x
  3. Step 3: Cross multiply
    94.20x = 128.82 × 93.66
  4. Step 4: Simplify right side
    94.20x = 12,065.28
  5. Step 5: Solve for x
    x = 12,065.28/94.20
  6. Step 6: Final answer
    x = 128.08

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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.