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Finding the Fourth Proportional to 94.14, 141.93 and 91.31

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Solution

The fourth proportional to 94.14, 141.93 and 91.31 is: 137.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.14 : 141.93 = 91.31 : x
  2. Step 2: Convert to fraction form
    94.14/141.93 = 91.31/x
  3. Step 3: Cross multiply
    94.14x = 141.93 × 91.31
  4. Step 4: Simplify right side
    94.14x = 12,958.92
  5. Step 5: Solve for x
    x = 12,958.92/94.14
  6. Step 6: Final answer
    x = 137.66

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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.