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Finding the Fourth Proportional to 74.14, 111.24 and 28.51

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Solution

The fourth proportional to 74.14, 111.24 and 28.51 is: 42.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.14 : 111.24 = 28.51 : x
  2. Step 2: Convert to fraction form
    74.14/111.24 = 28.51/x
  3. Step 3: Cross multiply
    74.14x = 111.24 × 28.51
  4. Step 4: Simplify right side
    74.14x = 3,171.17
  5. Step 5: Solve for x
    x = 3,171.17/74.14
  6. Step 6: Final answer
    x = 42.77

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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.