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Finding the Fourth Proportional to 29.11, 40.17 and 28.79

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Solution

The fourth proportional to 29.11, 40.17 and 28.79 is: 39.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.11 : 40.17 = 28.79 : x
  2. Step 2: Convert to fraction form
    29.11/40.17 = 28.79/x
  3. Step 3: Cross multiply
    29.11x = 40.17 × 28.79
  4. Step 4: Simplify right side
    29.11x = 1,156.72
  5. Step 5: Solve for x
    x = 1,156.72/29.11
  6. Step 6: Final answer
    x = 39.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.