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Finding the Fourth Proportional to 94.85, 129.94 and 91.20

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Solution

The fourth proportional to 94.85, 129.94 and 91.20 is: 124.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.85 : 129.94 = 91.20 : x
  2. Step 2: Convert to fraction form
    94.85/129.94 = 91.20/x
  3. Step 3: Cross multiply
    94.85x = 129.94 × 91.20
  4. Step 4: Simplify right side
    94.85x = 11,850.07
  5. Step 5: Solve for x
    x = 11,850.07/94.85
  6. Step 6: Final answer
    x = 124.94

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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.