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Finding the Fourth Proportional to 74.40, 111.49 and 28.72

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Solution

The fourth proportional to 74.40, 111.49 and 28.72 is: 43.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.40 : 111.49 = 28.72 : x
  2. Step 2: Convert to fraction form
    74.40/111.49 = 28.72/x
  3. Step 3: Cross multiply
    74.40x = 111.49 × 28.72
  4. Step 4: Simplify right side
    74.40x = 3,201.99
  5. Step 5: Solve for x
    x = 3,201.99/74.40
  6. Step 6: Final answer
    x = 43.04

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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.