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Finding the Fourth Proportional to 75.44, 112.88 and 68.72

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Solution

The fourth proportional to 75.44, 112.88 and 68.72 is: 102.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.44 : 112.88 = 68.72 : x
  2. Step 2: Convert to fraction form
    75.44/112.88 = 68.72/x
  3. Step 3: Cross multiply
    75.44x = 112.88 × 68.72
  4. Step 4: Simplify right side
    75.44x = 7,757.11
  5. Step 5: Solve for x
    x = 7,757.11/75.44
  6. Step 6: Final answer
    x = 102.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.