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Finding the Fourth Proportional to 64.62, 96.96 and 28.55

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Solution

The fourth proportional to 64.62, 96.96 and 28.55 is: 42.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.62 : 96.96 = 28.55 : x
  2. Step 2: Convert to fraction form
    64.62/96.96 = 28.55/x
  3. Step 3: Cross multiply
    64.62x = 96.96 × 28.55
  4. Step 4: Simplify right side
    64.62x = 2,768.56
  5. Step 5: Solve for x
    x = 2,768.56/64.62
  6. Step 6: Final answer
    x = 42.84

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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.