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Finding the Fourth Proportional to 32.21, 48.30 and 20.80

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Solution

The fourth proportional to 32.21, 48.30 and 20.80 is: 31.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    32.21 : 48.30 = 20.80 : x
  2. Step 2: Convert to fraction form
    32.21/48.30 = 20.80/x
  3. Step 3: Cross multiply
    32.21x = 48.30 × 20.80
  4. Step 4: Simplify right side
    32.21x = 1,004.64
  5. Step 5: Solve for x
    x = 1,004.64/32.21
  6. Step 6: Final answer
    x = 31.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.