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Finding the Fourth Proportional to 94.98, 142.98 and 81.75

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Solution

The fourth proportional to 94.98, 142.98 and 81.75 is: 123.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.98 : 142.98 = 81.75 : x
  2. Step 2: Convert to fraction form
    94.98/142.98 = 81.75/x
  3. Step 3: Cross multiply
    94.98x = 142.98 × 81.75
  4. Step 4: Simplify right side
    94.98x = 11,688.62
  5. Step 5: Solve for x
    x = 11,688.62/94.98
  6. Step 6: Final answer
    x = 123.06

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.