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Finding the Fourth Proportional to 29.10, 40.16 and 20.90

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Solution

The fourth proportional to 29.10, 40.16 and 20.90 is: 28.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.10 : 40.16 = 20.90 : x
  2. Step 2: Convert to fraction form
    29.10/40.16 = 20.90/x
  3. Step 3: Cross multiply
    29.10x = 40.16 × 20.90
  4. Step 4: Simplify right side
    29.10x = 839.34
  5. Step 5: Solve for x
    x = 839.34/29.10
  6. Step 6: Final answer
    x = 28.84

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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.