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Finding the Fourth Proportional to 97.20, 135 and 96.12

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Solution

The fourth proportional to 97.20, 135 and 96.12 is: 133.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.20 : 135 = 96.12 : x
  2. Step 2: Convert to fraction form
    97.20/135 = 96.12/x
  3. Step 3: Cross multiply
    97.20x = 135 × 96.12
  4. Step 4: Simplify right side
    97.20x = 12,976.20
  5. Step 5: Solve for x
    x = 12,976.20/97.20
  6. Step 6: Final answer
    x = 133.50

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.