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Finding the Fourth Proportional to 64.22, 96.31 and 18.55

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Solution

The fourth proportional to 64.22, 96.31 and 18.55 is: 27.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.22 : 96.31 = 18.55 : x
  2. Step 2: Convert to fraction form
    64.22/96.31 = 18.55/x
  3. Step 3: Cross multiply
    64.22x = 96.31 × 18.55
  4. Step 4: Simplify right side
    64.22x = 1,786.70
  5. Step 5: Solve for x
    x = 1,786.70/64.22
  6. Step 6: Final answer
    x = 27.82

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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.