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Finding the Fourth Proportional to 29.40, 40.50 and 21.21

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Solution

The fourth proportional to 29.40, 40.50 and 21.21 is: 29.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.40 : 40.50 = 21.21 : x
  2. Step 2: Convert to fraction form
    29.40/40.50 = 21.21/x
  3. Step 3: Cross multiply
    29.40x = 40.50 × 21.21
  4. Step 4: Simplify right side
    29.40x = 859.01
  5. Step 5: Solve for x
    x = 859.01/29.40
  6. Step 6: Final answer
    x = 29.22

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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.