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Finding the Fourth Proportional to 75, 103.49 and 67.65

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Solution

The fourth proportional to 75, 103.49 and 67.65 is: 93.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    75 : 103.49 = 67.65 : x
  2. Step 2: Convert to fraction form
    75/103.49 = 67.65/x
  3. Step 3: Cross multiply
    75x = 103.49 × 67.65
  4. Step 4: Simplify right side
    75x = 7,000.76
  5. Step 5: Solve for x
    x = 7,000.76/75
  6. Step 6: Final answer
    x = 93.34

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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.