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Finding the Fourth Proportional to 29.26, 40.35 and 21.90

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Solution

The fourth proportional to 29.26, 40.35 and 21.90 is: 30.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.26 : 40.35 = 21.90 : x
  2. Step 2: Convert to fraction form
    29.26/40.35 = 21.90/x
  3. Step 3: Cross multiply
    29.26x = 40.35 × 21.90
  4. Step 4: Simplify right side
    29.26x = 883.43
  5. Step 5: Solve for x
    x = 883.43/29.26
  6. Step 6: Final answer
    x = 30.19

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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.