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Finding the Fourth Proportional to 74.27, 111.37 and 43.80

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Solution

The fourth proportional to 74.27, 111.37 and 43.80 is: 65.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.27 : 111.37 = 43.80 : x
  2. Step 2: Convert to fraction form
    74.27/111.37 = 43.80/x
  3. Step 3: Cross multiply
    74.27x = 111.37 × 43.80
  4. Step 4: Simplify right side
    74.27x = 4,878.01
  5. Step 5: Solve for x
    x = 4,878.01/74.27
  6. Step 6: Final answer
    x = 65.68

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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.