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Finding the Fourth Proportional to 74.43, 111.60 and 28.74

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Solution

The fourth proportional to 74.43, 111.60 and 28.74 is: 43.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.43 : 111.60 = 28.74 : x
  2. Step 2: Convert to fraction form
    74.43/111.60 = 28.74/x
  3. Step 3: Cross multiply
    74.43x = 111.60 × 28.74
  4. Step 4: Simplify right side
    74.43x = 3,207.38
  5. Step 5: Solve for x
    x = 3,207.38/74.43
  6. Step 6: Final answer
    x = 43.09

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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.