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Finding the Fourth Proportional to 94.20, 129.91 and 86.83

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Solution

The fourth proportional to 94.20, 129.91 and 86.83 is: 119.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.20 : 129.91 = 86.83 : x
  2. Step 2: Convert to fraction form
    94.20/129.91 = 86.83/x
  3. Step 3: Cross multiply
    94.20x = 129.91 × 86.83
  4. Step 4: Simplify right side
    94.20x = 11,280.09
  5. Step 5: Solve for x
    x = 11,280.09/94.20
  6. Step 6: Final answer
    x = 119.75

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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.