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Finding the Fourth Proportional to 29.40, 40.20 and 29.22

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Solution

The fourth proportional to 29.40, 40.20 and 29.22 is: 39.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.40 : 40.20 = 29.22 : x
  2. Step 2: Convert to fraction form
    29.40/40.20 = 29.22/x
  3. Step 3: Cross multiply
    29.40x = 40.20 × 29.22
  4. Step 4: Simplify right side
    29.40x = 1,174.64
  5. Step 5: Solve for x
    x = 1,174.64/29.40
  6. Step 6: Final answer
    x = 39.95

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.