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Finding the Fourth Proportional to 32.00, 47.90 and 20.61

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Solution

The fourth proportional to 32.00, 47.90 and 20.61 is: 30.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    32.00 : 47.90 = 20.61 : x
  2. Step 2: Convert to fraction form
    32.00/47.90 = 20.61/x
  3. Step 3: Cross multiply
    32.00x = 47.90 × 20.61
  4. Step 4: Simplify right side
    32.00x = 987.12
  5. Step 5: Solve for x
    x = 987.12/32.00
  6. Step 6: Final answer
    x = 30.85

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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.