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Finding the Fourth Proportional to 97.11, 134.14 and 78.91

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Solution

The fourth proportional to 97.11, 134.14 and 78.91 is: 109.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.11 : 134.14 = 78.91 : x
  2. Step 2: Convert to fraction form
    97.11/134.14 = 78.91/x
  3. Step 3: Cross multiply
    97.11x = 134.14 × 78.91
  4. Step 4: Simplify right side
    97.11x = 10,584.99
  5. Step 5: Solve for x
    x = 10,584.99/97.11
  6. Step 6: Final answer
    x = 109.00

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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.