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Finding the Fourth Proportional to 75, 103.35 and 61.85

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Solution

The fourth proportional to 75, 103.35 and 61.85 is: 85.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    75 : 103.35 = 61.85 : x
  2. Step 2: Convert to fraction form
    75/103.35 = 61.85/x
  3. Step 3: Cross multiply
    75x = 103.35 × 61.85
  4. Step 4: Simplify right side
    75x = 6,391.68
  5. Step 5: Solve for x
    x = 6,391.68/75
  6. Step 6: Final answer
    x = 85.22

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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.