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Finding the Fourth Proportional to 29.21, 40.29 and 20

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Solution

The fourth proportional to 29.21, 40.29 and 20 is: 27.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.21 : 40.29 = 20 : x
  2. Step 2: Convert to fraction form
    29.21/40.29 = 20/x
  3. Step 3: Cross multiply
    29.21x = 40.29 × 20
  4. Step 4: Simplify right side
    29.21x = 805.80
  5. Step 5: Solve for x
    x = 805.80/29.21
  6. Step 6: Final answer
    x = 27.59

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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.