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Finding the Fourth Proportional to 64.22, 96.34 and 18.57

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Solution

The fourth proportional to 64.22, 96.34 and 18.57 is: 27.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.22 : 96.34 = 18.57 : x
  2. Step 2: Convert to fraction form
    64.22/96.34 = 18.57/x
  3. Step 3: Cross multiply
    64.22x = 96.34 × 18.57
  4. Step 4: Simplify right side
    64.22x = 1,788.94
  5. Step 5: Solve for x
    x = 1,788.94/64.22
  6. Step 6: Final answer
    x = 27.86

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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.