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Finding the Fourth Proportional to 74.07, 111.17 and 69.65

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Solution

The fourth proportional to 74.07, 111.17 and 69.65 is: 104.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.07 : 111.17 = 69.65 : x
  2. Step 2: Convert to fraction form
    74.07/111.17 = 69.65/x
  3. Step 3: Cross multiply
    74.07x = 111.17 × 69.65
  4. Step 4: Simplify right side
    74.07x = 7,742.99
  5. Step 5: Solve for x
    x = 7,742.99/74.07
  6. Step 6: Final answer
    x = 104.54

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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.