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Finding the Fourth Proportional to 75.44, 104.22 and 65.72

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Solution

The fourth proportional to 75.44, 104.22 and 65.72 is: 90.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.44 : 104.22 = 65.72 : x
  2. Step 2: Convert to fraction form
    75.44/104.22 = 65.72/x
  3. Step 3: Cross multiply
    75.44x = 104.22 × 65.72
  4. Step 4: Simplify right side
    75.44x = 6,849.34
  5. Step 5: Solve for x
    x = 6,849.34/75.44
  6. Step 6: Final answer
    x = 90.79

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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.