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Finding the Fourth Proportional to 74.61, 111.94 and 28.99

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Solution

The fourth proportional to 74.61, 111.94 and 28.99 is: 43.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.61 : 111.94 = 28.99 : x
  2. Step 2: Convert to fraction form
    74.61/111.94 = 28.99/x
  3. Step 3: Cross multiply
    74.61x = 111.94 × 28.99
  4. Step 4: Simplify right side
    74.61x = 3,244.97
  5. Step 5: Solve for x
    x = 3,244.97/74.61
  6. Step 6: Final answer
    x = 43.49

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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.