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Finding the Fourth Proportional to 97.68, 135 and 75.84

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Solution

The fourth proportional to 97.68, 135 and 75.84 is: 104.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.68 : 135 = 75.84 : x
  2. Step 2: Convert to fraction form
    97.68/135 = 75.84/x
  3. Step 3: Cross multiply
    97.68x = 135 × 75.84
  4. Step 4: Simplify right side
    97.68x = 10,238.40
  5. Step 5: Solve for x
    x = 10,238.40/97.68
  6. Step 6: Final answer
    x = 104.82

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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.