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Finding the Fourth Proportional to 74.19, 111.29 and 28.56

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Solution

The fourth proportional to 74.19, 111.29 and 28.56 is: 42.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.19 : 111.29 = 28.56 : x
  2. Step 2: Convert to fraction form
    74.19/111.29 = 28.56/x
  3. Step 3: Cross multiply
    74.19x = 111.29 × 28.56
  4. Step 4: Simplify right side
    74.19x = 3,178.30
  5. Step 5: Solve for x
    x = 3,178.30/74.19
  6. Step 6: Final answer
    x = 42.84

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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.