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Finding the Fourth Proportional to 74.65, 111.91 and 40.42

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Solution

The fourth proportional to 74.65, 111.91 and 40.42 is: 60.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.65 : 111.91 = 40.42 : x
  2. Step 2: Convert to fraction form
    74.65/111.91 = 40.42/x
  3. Step 3: Cross multiply
    74.65x = 111.91 × 40.42
  4. Step 4: Simplify right side
    74.65x = 4,523.27
  5. Step 5: Solve for x
    x = 4,523.27/74.65
  6. Step 6: Final answer
    x = 60.60

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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.