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Finding the Fourth Proportional to 74.28, 111.40 and 30.95

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Solution

The fourth proportional to 74.28, 111.40 and 30.95 is: 46.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.28 : 111.40 = 30.95 : x
  2. Step 2: Convert to fraction form
    74.28/111.40 = 30.95/x
  3. Step 3: Cross multiply
    74.28x = 111.40 × 30.95
  4. Step 4: Simplify right side
    74.28x = 3,447.70
  5. Step 5: Solve for x
    x = 3,447.70/74.28
  6. Step 6: Final answer
    x = 46.41

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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.