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Finding the Fourth Proportional to 64.53, 96.78 and 18.86

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Solution

The fourth proportional to 64.53, 96.78 and 18.86 is: 28.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.53 : 96.78 = 18.86 : x
  2. Step 2: Convert to fraction form
    64.53/96.78 = 18.86/x
  3. Step 3: Cross multiply
    64.53x = 96.78 × 18.86
  4. Step 4: Simplify right side
    64.53x = 1,825.44
  5. Step 5: Solve for x
    x = 1,825.44/64.53
  6. Step 6: Final answer
    x = 28.29

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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.